Removing underscores from change log.  Also updated the 'Start Canvas' decription to reflect move from Canvas to Sequence.
Merge pull request #376 from mikeapp/change_log_underscores

Change log updates
Change Log additions from issues
Use latest Proofer
Ignore Gemfile lock
Merge pull request #378 from IIIF/changelogs

Change Log additions from issues
Merge pull request #380 from penibelst/upgrade-proofer

Use latest Proofer
Merge pull request #381 from IIIF/master

Merging and can back out if needed on server