Respect file paths in destination

Introduces grunt-frienly way of configuring task with glob patterns.
Define 'cwd' and 'dest' directories and list your sources under 'src' with patterns that support nested directories:

  - *.html
  - {,*/}*.html
  - {,**/}*.html

Results are put to 'dest' with respect for their original path under 'cwd'. Fixes the issue of results being dumped into single directory.
Fix travis
Merge pull request #60 from dmitrybelyakov/Feature/RespectPaths

Respect file paths in destination