Release 0.6.0 Alpha -> Beta

This release has 474 commits after 0.5.0

@todo Will be completed

Analyzers:

• Analyzer return and yield in one method, #185 (original @Lexty, rebased and fixed by @ovr)
• Move notice line number to correct place (@barroca) #9616e15
• Modified DoNotUseLabel to accept goto statements as well (@nikhilsaldanha) #4a1bc93

Compiler:

• Support for Exit_, Isset_, Print_, Coalesce (?? operator), Empty_, Break_, Continue_, Goto, Label, InlineHTML, Nop, Global_, Static_, Declare_, Const_, Eval_, ErrorSuppress and etc (@DMler)
• Initial TraitDefintion support (@ovr)
• Fix Bug #107 (@ddmler)

Docs:

• Fixed grammar mistakes (@ksheps)

Plugins:

• Integration with CodeClimate (@ovr)

Another:

• Use caret operator instead of tilde for dependencies (Composer) (@ravage84)

Thanks @ddmler @K-Phoen @nikhilsaldanha @nikolaykovenko @chasingSublimity @Lexty @SidRoberts @ksheps and all another developers

Full diff: 0.5.0...0.6.0