Multicolor headers

Summary: This adds a handful of 'Main Header' colors to change the look of Phabricator very slightly. I know I would probably set my dev header to a different color.

Test Plan: Tested each css class and color, can add more in the future.

Reviewers: epriestley, btrahan

Reviewed By: btrahan

CC: Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D7731
Fix over-matching of quoted text for message bodies beginning with "On..."

Summary:
A user sent a message to Phabricator which looked like:

  On blah blah blah ?

  On <date>, <user> wrote:
  > blah blah blah

The current algorithm is too aggressive and thinks lines 1-3 are //all// the "On ... wrote:" string. Instead, patch only the most recent "On".

Test Plan: Added a failing test and made it pass.

Reviewers: btrahan, zeeg

Reviewed By: zeeg

CC: aran

Differential Revision: https://secure.phabricator.com/D7732
Make nonscalar field saves raise a more useful exception from LiskDAO

Summary:
If you do something like this:

  // Missing $user->getPHID()!
  $object->setUserPHID($user)->save();

...you get a very unhelpful exception:

  Expected a scalar or null for %s conversion. Query: %s

This doesn't give you any hints about what's wrong. Instead, provide a more useful exception:

  Unable to insert or update object of class DifferentialRevision, field 'title' has a nonscalar value.

Test Plan: {F87614}

Reviewers: hach-que, btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D7725
Phragment v0

Summary: Ref T4205.  This is an initial implementation of Phragment.  You can create and browse fragments in the system (but you can't yet view a fragment's patches / history).

Test Plan: Clicked around and created fragments.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Maniphest Tasks: T4205

Differential Revision: https://secure.phabricator.com/D7726
Implement update and history controllers in Phragment

Summary: Depends on D7726.  This adds a history controller (for viewing a list of patches associated with a fragment) and an update controller, for creating a new patch of a fragment.

Test Plan: Updated and viewed history of fragments.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Maniphest Tasks: T4205

Differential Revision: https://secure.phabricator.com/D7727
Implement "Download ZIP" controller for Phragment

Summary: Depends on D7727.  This adds support for downloading a fragment and all it's children as a ZIP file.  Fragments that have children automatically become directories in the ZIP file.

Test Plan: Downloaded a fragment as a ZIP and was able to extract the contents successfully.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Maniphest Tasks: T4205

Differential Revision: https://secure.phabricator.com/D7728
Implement support for creating and updating fragments from ZIPs

Summary:
This implements support for creating and updating fragments from ZIP files.  It allows you to upload a ZIP via the Files application, create a fragment from it, and have it recursively imported into Phragment.  Updating that folder with another ZIP will recursively create, update and delete files as appropriate.

The logic for creating and updating fragments from files has also been centralized into the PhragmentFragment class.  Directories are also now supported; a directory fragment is simply a fragment that has no patches; thus a directory fragment can be converted to a file fragment by uploading a first patch for it.

Test Plan: Uploaded ZIP files through the interface and saw all of the fragments get created and updated as expected.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Maniphest Tasks: T4205

Differential Revision: https://secure.phabricator.com/D7729