Added Emoji support

Added Emoji support, that fixes #25

Decreased minimal NodeJS version to 4

Changed minimal NodeJS to 4. Version 6 will be in the next major version of "json-to-ast"

v2.0.0

• Over-escaped identifier's value fixing (#17)
• Changed case for node type names
• Changed option "verbose" parameter to "loc"
• Changed "rawValue" to "raw"
• Added "raw" to "Identifier" node
• Added pretty message output

Error's view

• Changed error's view (#18)

Infinite loop in parseObject for empty objects when !verbose

• Fixed issue Infinite loop in parseObject for empty objects when !verbose

Updated structure

• Changed value node to literal
• Added rawValue for literal. value is cast to type now
• Changed key node to identifier
• Renamed position to loc
• Renamed char in loc to offset
• Added source to loc
• Added tests from https://github.com/nst/JSONTestSuite

Fixed unicode parser bug

v1.2.15

Updated package version