Merge pull request #1161 from meetme2meat/master

Corrected bundle command in Contribution.md
Add 'remember' note for setting store in initializer

In the 'Testing with CarrierWave' section.

[ci skip]
Merge pull request #1160 from pjg/patch-1

Add 'remember' note for setting store in initializer
Blockquote the 'bundle exec rake' command