Send email with job approval notification

Fixes #1
Minor consistency fixes
added email templates
Merge pull request #7 from python-jobs-board/console-email-backend-for-local-dev

Use console email backend for local development
Prevent drawing fielderrors over other labels

Fixes (sather simplisticly) #6
moved email templates to proper location
Merge pull request #9 from python-jobs-board/fix-form-field-validation-errors-display

Fix form field validation errors display
made changes to source scss file
Merge pull request #10 from python-jobs-board/fix-form-field-validation-errors-display

Made changes to source scss file
added test checking that approval email was sent
also check if offer contact name is in the message
Merge pull request #8 from python-jobs-board/generate-approval-email

Send email with job approval notification
Send email with job offer rejection notification

Also refactored signal handling code to avoid duplicating code concerned
with sending the messages.
Merge pull request #11 from python-jobs-board/generate-rejection-email

Send email with job offer rejection notification
Added ability to choose canned response in the comment form
Canned responses should be displayed only for reviewers.
added accept and reject buttons to offer details screen
updated email subjects
Merge pull request #14 from python-jobs-board/approve-reject-buttons-on-posting-details

Approve reject buttons on posting details
Merge pull request #436 from python-jobs-board/master

Implement the phase 1 changes needed to get the jobs app off the ground