Recommend version-specific python server commands
Added IE10 tap highlight disable & WebKit→IE10 doc
Fix link to Pull Request help in CONTRIBUTING.md

GitHub changed their help page URLs and did not correctly redirect the
old Pull Request help URL.
Merge remote branch 'h5bp/master'
added files to exlude in build/config/project.properties
Merge branch 'placeholder'
Merged with placeholder branch, updated index.html, ruby and sass files exlude from vcs and build