Merge remote-tracking branch 'origin/master' into str_size_and_int64

* origin/master:
  Added information in NEWS and UPGRADING
  add T_POW (**) operator
  add NEWS block for 5.6.0alpha3
  updated libs_version.txt
  updated libs_version.txt
  update libs_version.txt

Conflicts:
	Zend/zend_ini_scanner.c
	ext/standard/math.c

Author: weltling

Zend/zend_language_parser.y

@@ -72,7 +72,7 @@ static YYSIZE_T zend_yytnamerr(char*, const char*);
 %token T_PRINT        "print (T_PRINT)"
 %right T_YIELD
 %token T_YIELD        "yield (T_YIELD)"
-%left '=' T_PLUS_EQUAL T_MINUS_EQUAL T_MUL_EQUAL T_DIV_EQUAL T_CONCAT_EQUAL T_MOD_EQUAL T_AND_EQUAL T_OR_EQUAL T_XOR_EQUAL T_SL_EQUAL T_SR_EQUAL
+%left '=' T_PLUS_EQUAL T_MINUS_EQUAL T_MUL_EQUAL T_DIV_EQUAL T_CONCAT_EQUAL T_MOD_EQUAL T_AND_EQUAL T_OR_EQUAL T_XOR_EQUAL T_SL_EQUAL T_SR_EQUAL T_POW_EQUAL
 %token T_PLUS_EQUAL   "+= (T_PLUS_EQUAL)"
 %token T_MINUS_EQUAL  "-= (T_MINUS_EQUAL)"
 %token T_MUL_EQUAL    "*= (T_MUL_EQUAL)"
@@ -109,6 +109,7 @@ static YYSIZE_T zend_yytnamerr(char*, const char*);
 %nonassoc T_INSTANCEOF
 %token T_INSTANCEOF  "instanceof (T_INSTANCEOF)"
 %right '~' T_INC T_DEC T_INT_CAST T_DOUBLE_CAST T_STRING_CAST T_ARRAY_CAST T_OBJECT_CAST T_BOOL_CAST T_UNSET_CAST '@'
+%right T_POW
 %token T_INC "++ (T_INC)"
 %token T_DEC "-- (T_DEC)"
 %token T_INT_CAST    "(int) (T_INT_CAST)"
@@ -213,6 +214,8 @@ static YYSIZE_T zend_yytnamerr(char*, const char*);
 %token T_DIR             "__DIR__ (T_DIR)"
 %token T_NS_SEPARATOR    "\\ (T_NS_SEPARATOR)"
 %token T_ELLIPSIS        "... (T_ELLIPSIS)"
+%token T_POW             "** (T_POW)"
+%token T_POW_EQUAL       "**= (T_POW_EQUAL)"
 
 %% /* Rules */
 
@@ -778,6 +781,7 @@ expr_without_variable:
 	|	variable T_PLUS_EQUAL expr 	{ zend_check_writable_variable(&$1); zend_do_end_variable_parse(&$1, BP_VAR_RW, 0 TSRMLS_CC); zend_do_binary_assign_op(ZEND_ASSIGN_ADD, &$$, &$1, &$3 TSRMLS_CC); }
 	|	variable T_MINUS_EQUAL expr	{ zend_check_writable_variable(&$1); zend_do_end_variable_parse(&$1, BP_VAR_RW, 0 TSRMLS_CC); zend_do_binary_assign_op(ZEND_ASSIGN_SUB, &$$, &$1, &$3 TSRMLS_CC); }
 	|	variable T_MUL_EQUAL expr		{ zend_check_writable_variable(&$1); zend_do_end_variable_parse(&$1, BP_VAR_RW, 0 TSRMLS_CC); zend_do_binary_assign_op(ZEND_ASSIGN_MUL, &$$, &$1, &$3 TSRMLS_CC); }
+	|	variable T_POW_EQUAL expr		{ zend_check_writable_variable(&$1); zend_do_end_variable_parse(&$1, BP_VAR_RW, 0 TSRMLS_CC); zend_do_binary_assign_op(ZEND_ASSIGN_POW, &$$, &$1, &$3 TSRMLS_CC); }
 	|	variable T_DIV_EQUAL expr		{ zend_check_writable_variable(&$1); zend_do_end_variable_parse(&$1, BP_VAR_RW, 0 TSRMLS_CC); zend_do_binary_assign_op(ZEND_ASSIGN_DIV, &$$, &$1, &$3 TSRMLS_CC); }
 	|	variable T_CONCAT_EQUAL expr	{ zend_check_writable_variable(&$1); zend_do_end_variable_parse(&$1, BP_VAR_RW, 0 TSRMLS_CC); zend_do_binary_assign_op(ZEND_ASSIGN_CONCAT, &$$, &$1, &$3 TSRMLS_CC); }
 	|	variable T_MOD_EQUAL expr		{ zend_check_writable_variable(&$1); zend_do_end_variable_parse(&$1, BP_VAR_RW, 0 TSRMLS_CC); zend_do_binary_assign_op(ZEND_ASSIGN_MOD, &$$, &$1, &$3 TSRMLS_CC); }
@@ -802,6 +806,7 @@ expr_without_variable:
 	|	expr '+' expr 	{ zend_do_binary_op(ZEND_ADD, &$$, &$1, &$3 TSRMLS_CC); }
 	|	expr '-' expr 	{ zend_do_binary_op(ZEND_SUB, &$$, &$1, &$3 TSRMLS_CC); }
 	|	expr '*' expr	{ zend_do_binary_op(ZEND_MUL, &$$, &$1, &$3 TSRMLS_CC); }
+	|	expr T_POW expr	{ zend_do_binary_op(ZEND_POW, &$$, &$1, &$3 TSRMLS_CC); }
 	|	expr '/' expr	{ zend_do_binary_op(ZEND_DIV, &$$, &$1, &$3 TSRMLS_CC); }
 	|	expr '%' expr 	{ zend_do_binary_op(ZEND_MOD, &$$, &$1, &$3 TSRMLS_CC); }
 	| 	expr T_SL expr	{ zend_do_binary_op(ZEND_SL, &$$, &$1, &$3 TSRMLS_CC); }