Fix crash of RescueException on rescue with no class specification
Merge pull request #168 from yujinakayama/fix-rescueexception-crash

Fix crash of RescueException on rescue with no class specification
Use Parser::CurrentRuby
Remove a debug puts
Remove .document
Use src instead of source_map everywhere
Use decomposition where it makes sense
Disable SymbolsSnakeCase

A lot of Ruby code uses CamelCase symbols for JSON, class names, etc so
this rule has to be reworked.
Rework cops to match directly sexps
Port DefParentheses to Parser
Port TrivialAccessors to Parser
Port EmptyLineBetweenDefs to Parser