Pattern matching for sections.

  - Implemented regexp pattern matching.
  - Ignore `.idea` files and `vendor` folder
  - Added `rspec` task to Rakefile.
  - Added spec tests for `:all` and for regexp pattern matching.
  - Updated `README` with info about pattern-matching sections.
Merge branch 'pattern_matching'
Version bump to 0.0.3
Cleanup based on pullreview.com service
Merge pull request #4 from drewfradette/cleanup

Cleanup based on pullreview.com service
Added recursive-open-struct as gem dependency
Updated README