Clean up some Differential behaviors

Summary:
Ref T2222.

  - Restore mail tags for ApplicationTransactions mail.
  - Restore subject line verbs.
  - Denormalize line count and repository PHID.
  - Fix an issue with the mailgun adapter where headers weren't attached properly.

Test Plan: Sent some mail, verified it had correct subjects and tags.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2222

Differential Revision: https://secure.phabricator.com/D8378
Workboards - add transactions for column changes

Summary:
adds ManiphestTransaction::TYPE_PROJECT_COLUMN and makes it work. Had to clean up the Javascript ever so slightly as it was sending up the string "null" when it should just omit the data in these cases. Ref T4422.

NOTE: this is overall a bit buggy - e.g. move a task Foo from column A to top of column B; refresh; task Foo is at bottom of column B and should be at top of column B - but I plan on additional diff or three to clean this up.

Test Plan: dragged tasks around columns. clicked on those tasks and saw some nice transactions.

Reviewers: epriestley

CC: Korvin, epriestley, aran

Maniphest Tasks: T4422

Differential Revision: https://secure.phabricator.com/D8366
(PhabricatorIRCProtocolAdapter.connect) Use recommended connection registration order from RFC{1459,2812}

http://tools.ietf.org/html/rfc1459.html#section-4.1 and http://tools.ietf.org/html/rfc2812#section-3.1
 mentions that client should send the PASS first, then the latter of NICK/USER.

This is tested and confirmed working with ngircd commit 485d0aec813db9966922f17aae044df2d82b0b67

See: <https://github.com/facebook/phabricator/pull/524>

Reviewed by: epriestley
Check for null, strictly, in maniphest.update param validation

Summary:
If the first non-null entry in the params array is falsey, the request bombs.

Something like {"id":279,"projectPHIDs":[],"status":"0","ownerPHID":"PHID-USER-on3xxsnaljmfn36d4b7a"}

Test Plan:
Before:

  echo '{"id":279,"projectPHIDs":[],"status":"0","ownerPHID":"PHID-USER-cj3cpuh7oorbmnn2pl5g"}' | arc call-conduit maniphest.update
  {"error":"ERR-NO-EFFECT","errorMessage":"ERR-NO-EFFECT: Update has no effect.","response":null}

After:

  echo '{"id":279,"projectPHIDs":[],"status":"0","ownerPHID":"PHID-USER-cj3cpuh7oorbmnn2pl5g"}' | arc call-conduit maniphest.update
  {"error":null,"errorMessage":null,"response":{"id":"279","phid":"PHID-TASK-lbwcq3pmur2c5fuqqhlx"...

Reviewers: garoevans, epriestley, #blessed_reviewers

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D8391