update the default coffeescript checker

No need to generate a file when linting, as the coffeescript compiler
will do that for you.

This has been tested with coffeescript 1.6.2.

Also: use options over flags for readibility
php/php: prevent xdebug.cli_color from messing with checks.
Skip running in special buffers.
Merge pull request #595 from joshuarh/simplify-coffeescript-checker

update the default coffeescript checker
Added syntax checker for coq.
Merge pull request #596 from supki/syntax-checker-coqtop

Added syntax checker for coq.
Makes sparse aware of &tabstop.
Minor cleanup.
Fixes handling of g:syntastic_quiet_warnings.
added vhdl syntax checker utilizing ghdl
Merge pull request #601 from Jaydyou/master

added vhdl syntax checker
vhdl/ghdl checker: use syntastic#makeprg#build
HTML checker using http://validator.nu.
Fixes handling of g:syntastic_quiet_warnings.

Fixes signs (leftover from commit 878bcea).
Fix shell pipe hack.
Fix signs initialization.

Signs should be initialized even if they aren't enabled at startup.
Error format fix for pylint.
Error format fix for checkbashisms.
add the first stab at the contributing doc
update contributing file