rename json.existsKey to hasKey, deprecates existsKey
better error message for subtle nil errors
another attempt to implement #448
fixes #458
Merge pull request #455 from fowlmouth/patch-7

rename json.existsKey to hasKey, deprecates existsKey
Merge branch 'master' of github.com:Araq/Nimrod
more accurate effects for times.nim; bugfix for the JS codegen
Added unittest module to docgen.
next steps to a luajit codegen
astToStr is now immediate
Merge branch 'master' of github.com:Araq/Nimrod
fixes #385
fixes semicolon parsing issue
tiny doc improvement
manyloc test should be green again
new scoping rules for 'if' now active
fixes #451
fixes #456
implemented dataflow analysis; activate via --warning[Uninit]:on
made macros.dumptree and dumplisp immediate, deprecated the *_imm versions