Fix #93: Check if node exists
Merge pull request #109 from csscomb/tg/93

Check if node exists (#93)
First steps to detection
Added the detection for colon-space option; added way to tell which options to detect
Added the detection for color-case option
Added the detection for color-shorthand option
Added integral detection test
Added the detection for combinator-space option
Added the detection for elements-case option
Added the detection for eof-newline option
Added the detection for unitless zero option
Added the detection for leading-zero option
Added the detection for strip-spaces option
Added the detection for remove-empty-rulesets option
Added the detection for stick-brace option
Added the detection for rule-indent option
Added the detection for block-indent option
Making sure the detected options from the result work as a template
Empty string should be a valid value for stick-brace option
Added basic usage of .css file as config