tweak checkstyle config to be friendly (#226)

Author: vmarchaud

config/checkstyle.xml

@@ -57,7 +57,6 @@
             <property name="option" value="TEXT"/>
             <property name="tokens" value="LITERAL_TRY, LITERAL_FINALLY, LITERAL_IF, LITERAL_ELSE, LITERAL_SWITCH"/>
         </module>
-        <module name="NeedBraces"/>
         <module name="LeftCurly">
             <property name="maxLineLength" value="120"/>
         </module>
@@ -67,10 +66,10 @@
             <property name="tokens" value="CLASS_DEF, METHOD_DEF, CTOR_DEF, LITERAL_FOR, LITERAL_WHILE, LITERAL_DO, STATIC_INIT, INSTANCE_INIT"/>
         </module>
         <module name="WhitespaceAround">
-            <property name="allowEmptyConstructors" value="true"/>
-            <property name="allowEmptyMethods" value="true"/>
+            <property name="allowEmptyConstructors" value="false"/>
+            <property name="allowEmptyMethods" value="false"/>
             <property name="allowEmptyTypes" value="true"/>
-            <property name="allowEmptyLoops" value="true"/>
+            <property name="allowEmptyLoops" value="false"/>
             <message key="ws.notFollowed"
                      value="WhitespaceAround: ''{0}'' is not followed by whitespace. Empty blocks may only be represented as '{}' when not part of a multi-block statement (4.1.3)"/>
             <message key="ws.notPreceded"
@@ -149,17 +148,8 @@
             <property name="lineWrappingIndentation" value="4"/>
             <property name="arrayInitIndent" value="2"/>
         </module>
-        <module name="AbbreviationAsWordInName">
-            <property name="ignoreFinal" value="false"/>
-            <property name="allowedAbbreviationLength" value="1"/>
-        </module>
         <module name="OverloadMethodsDeclarationOrder"/>
         <module name="VariableDeclarationUsageDistance"/>
-        <module name="CustomImportOrder">
-            <property name="specialImportsRegExp" value="com.google"/>
-            <property name="sortImportsInGroupAlphabetically" value="true"/>
-            <property name="customImportOrderRules" value="STATIC###THIRD_PARTY_PACKAGE###STANDARD_JAVA_PACKAGE"/>
-        </module>
         <module name="MethodParamPad"/>
         <module name="OperatorWrap">
             <property name="option" value="NL"/>
@@ -174,9 +164,6 @@
         </module>
         <module name="NonEmptyAtclauseDescription"/>
         <module name="JavadocTagContinuationIndentation"/>
-        <module name="SummaryJavadocCheck">
-            <property name="forbiddenSummaryFragments" value="^@return the *|^This method returns |^A [{]@code [a-zA-Z0-9]+[}]( is a )"/>
-        </module>
         <module name="JavadocParagraph"/>
         <module name="AtclauseOrder">
             <property name="tagOrder" value="@param, @return, @throws, @deprecated"/>