Update composer.json
Update composer.json
Merge pull request #28 from cordoval/patch-1

Update composer.json
Initial draft of expander mechanism with StartsWith expander example
Replaced [] with array() in AST\Expander class for php 5.3 support
Refactoring
Added Boolean and Null argument types support
Added negative numbers support
Added  argument to StartsWith expander
Set Lexer as a dependency of Parser and Parser as a dependency of StringMatcher
Added possibility to add new expander definitions
Added notBlank expander
Changed expanderName definition