sourceMap support (wip)

added concat.coffee - manage compiled sources concat. produce map

source_file handle new compiler result : {compiled, map}

source_file keep copy of compiled source and have 'sourceMap' property
commonJs wrapper correctly setup input map, removed concat.coffee, (in generate)
merge sourcemap from upstream
bad parsing of compilers response
Merge pull request #567 from plepers/sm_fixes

SourceMaps - bad parsing of compilers response