Turn off load balancing and rack sensitive by default, since both require extra
administrative setup that users seem to be confused about.

(We've noticed this both at OpenTable and @eliast mentions the same in #277)
Fix mail subject encoding

https://community.oracle.com/thread/1589504?start=0&tstart=0
Merge pull request #290 from HubSpot/fix_ui_sandbox_for_non_singularity_executor

Makes sandbox work for default executor
Merge pull request #284 from stevenschlansker/no-default-lb

Turn off load balancing and rack sensitive by default, since both require setup
Merge pull request #291 from stevenschlansker/email-encoding-fix

Fix mail subject encoding
more info about our singularity box
improve task file browser further
handle slave port variables.
Merge pull request #292 from HubSpot/fix_ui_sandbox_for_non_singularity_executor

improve task file browser further
Merge branch 'master' into hs_staging