Change "Begin Activity" to "Next Activity" (last page of an activity)

[#70358066]

https://www.pivotaltracker.com/story/show/70358066
Update .gitignore (Sublime Text project files)
Add buttons for creating a new activity and sequence on home page

[#70161558]
cap task for mysqldump on remotes, ignoring answers, runs, & anonymous

Just pull down the data that makes sense to copy for a DB restore locally.
Allow developers to use mysql2 or sqlite3 active record drivers locally.
Certain versions of mysql don't allow default text / blob values.
Reformat crediting in activities

[#68560072]
Change the secondary color of air pollution theme

[#71693122]
Add the ID number to sequences and activities in all listings

[#71696810]
Update README.md, add 'rake db:test:prepare' step
Attempt to fix travis build.
Fix deployment issue, and silence some gemfile warnings.
Revert unintentional change.
Add white background on Sequence Home page

[#71755324]
Add underline to activity table of contents links (on hover)

[#71692012]
Modify background on the Sequence Home Page

[#71755324]

Group description, estimated time box and activities in one container
with white background (0.85 alpha).
Change style of activities displayed in a sequence

[#71692056]
Fix issues with activities alignment in Safari

[#71692056]
Add space for 2 lines activities titles on the sequence home page

[#71592716]
Boost color of the activity backgorund (hover effect)

[#71692056]