Fix set_starred syncback actions.
[build/setup.sh] Fix install permissions when the host has umask 0077

Test Plan:
- Add "umask 0077" to my .bashrc
- vagrant destroy
- vagrant up --provision
- Check the permissions of
  /usr/local/lib/python2.7/dist-packages/pip-1.5.6.egg-info/entry_points.txt
  inside the VM.  It should be world-readable.

Reviewers: siro

Reviewed by: siro
Spawn a remote debugger in a separate greenlet

Summary: This code adds support for spawning a remote debugger if the DEBUG_CONSOLE_ON is specified. The debuggers listens on localhost on port $PID for telnet connections. It gives access to a simple REPL with the possibility of using the heapy heap profiler to inspect the heap.

Test Plan: Ran the code.

Reviewers: emfree, charles

Reviewed By: charles

Projects: #sync-engine

Differential Revision: https://review.inboxapp.com/D637
Add support for user-provided IMAP settings; refactor auth.

Summary:
This commit implements support for user-provided IMAP and SMTP settings, along
with related cleanup and refactoring in the auth code.

* Allow IMAP and SMTP endpoints for ImapAccounts to be overridden on a
  per-account basis.
* Define a "custom" provider for accounts with such overrides.
* Refactor auth modules to move functionality into AuthHandler classes.
* Refactor OAuth code, consolidating functionality split between the
  inbox.oauth and inbox.auth.oauth modules.
* Define interactive_auth() method on AuthHandler subclasses, to handle the
  flow of authing via bin/inbox-auth. Previously, this functionality was partly
  implemented in create_auth_account functions, and partly scattered.

Test Plan:
Add unit tests; add account with custom settings and ensure that
sync and sending works; run bin/inbox-auth for different account types.

Reviewers: charles

Reviewed By: charles

Differential Revision: https://review.inboxapp.com/D639
Fix typos in OAuth interactive auth.
Also fix create_account parameters in unit tests.
Add super simple search interface and indexing script to API.

Test Plan: None, for now.

Reviewers: kav-ya

Reviewed By: kav-ya

Differential Revision: https://review.inboxapp.com/D644
Merge pull request #1 from inboxapp/master

update