fix double comma issue when not using Modernizr
Merge pull request #60 from yuijim/bugfix-double-comma

fix double comma issue when not using Modernizr
Fixes #56
Improving Contribution section in documentation
Fixes #61
Merge pull request #62 from piotrkulpinski/issue-61

Fixes #61
Fixes #63
Fixes #64
Copying PIE to proper destination
Updating documentation
Release v0.3.3
Merge branch 'dev-warning' into dev