Dr hiring emails fixes

Fixed a majority of the issues Alexandra pointed out regarding the hiring emails. There are 3 design related issues I didn't fix yet but I added issues for them so we can come back to them soon depending on our priorities. See list of what was and wasn't fixed below. Similar to before, you should review this pull request via the heroku version: http://foundry-app-dev.herokuapp.com/

FIXED:
-Probably want to indicate the 'default' email from (stanfordhci.odesk@gmail.com) so senders know what will happen if they don't fill it out. Maybe using placeholder text?
-When you send the email, it lists "from:" and "to:" but does not include any information there. Either remove it or have it display emails. (If we are sending to multiple panel members, maybe remove the "to" and update the “from"
-You can send a task unavailable email to nobody ("to" is not required)
-Task unavailable emails don't seem to send even when information is proper
-Form labels are bold on 'available' but not on 'accept' or ‘unavailable’
-You can see everyone the email is sent to (not bcc’ing)
-The chat log on the bit.ly/foundryexample should be cleared out (not tied to the branch merge)

DIDN'T FIXED YET (ADDED ISSUES IN GITHUB): 
-No indication of which email is open on the sidebar. Can we make the sidebar menu items 'active' maybe using the css from hover? 
-We may want to indicate when emails have been sent or keep a log of who they were sent to (design question) because there is no "sent" receipt in the manual send folder for a user's email, no other version of a receipt
-Probably want a one liner description for each type of email below the header