Monkey patch in synchronous test helpers.

These methods make it easy to test code involving deferreds in a synchronous
and deterministic manner, rather than having to spin the reactor.
Merge branch 'sync-test-helpers' of git://github.com/tomprince/buildbot
Fixed grep command for IRC in log

With grep IRC there is not output from cat on the log file but with grep -i irc there is, see e.g.
```
$ cat master/twistd.log | grep IRC
$ cat master/twistd.log | grep -i irc
2013-04-15 13:26:44+0200 [-] Starting factory <buildbot.status.words.IrcStatusFactory instance at 0x26ab638>
2013-04-15 13:26:58+0200 [IrcStatusBot,client] <buildbot.status.words.IrcStatusBot instance at 0x23ea4d0>: I have joined #buildbot-test
2013-04-15 13:27:29+0200 [-] Starting factory <buildbot.status.words.IrcStatusFactory instance at 0x26b8170>
2013-04-15 13:27:29+0200 [IrcStatusBot,client] not scheduling reconnection attempt
2013-04-15 13:27:29+0200 [IrcStatusBot,client] Stopping factory <buildbot.status.words.IrcStatusFactory instance at 0x26ab638>
2013-04-15 13:27:42+0200 [IrcStatusBot,client] <buildbot.status.words.IrcStatusBot instance at 0x25a10e0>: I have joined #buildbot-test
```
Thus, maybe the example line from the log should be changed too?

I use
Buildbot version: 0.8.6p1
Twisted version: 12.2.0
Merge branch 'master' of git://github.com/Sleft/buildbot
fix typo in gh-pull 693
Fixed inline code and command formatting

Inline code and command formatting should be consistent and clear.
Merge pull request #695 from Sleft/master

Fixed inline code and command formatting
Fixed phrasing and formatted commands and code as such
Fixed inline code and command formatting
Note and warning about distribution specific package managers
Preferred way to install is via pip

To be consistent with the manual
Less repetetive when using synonym

Also fixed command formatting
Fixed link
Merge branch 'master' of git://github.com/Sleft/buildbot
Merge branch 'master' of github.com:buildbot/buildbot