Add doc/ to .gitignore

[ci skip]
Fix NoMethodError masking a problem on Travis.
Travis: bump chrome revision.
Remove debug output unless $DEBUG is set.

[ci skip]
Travis: Download the 64-bit version of Chrome.
Travis: fix /dev/shm permissions to make chrome work
Try the official chromedriver release
Revert "Try the official chromedriver release"

This reverts commit a3e741637fe7b58d178656d9c8bae441d735d279.
Bump watirspec
Allow phantomjs to fail until Jarmo gets the binary upgraded to 64-bit.
Bump watirspec
Make docs less confusing [ci skip]
Bump watirspec.
Add Code Climate and Gemnasium badge.

[ci skip]
Add coveralls
Try to use latest 64bit official binary for PhantomJS.
Add gem version badge.

[ci skip]
Use correct PhantomJS archive filename.
Use PhantomJS name in a variable.
Update from the HTML spec. Removes <command> and adds <menuitem>, <main>.