Patch Manager to handle newline in header line

[abeccati]

Patch Manager shows patch as pending even if it is applied when a newline is present in the header line.

Since ​common practice calls for the ability to provide more detail in a commit message than a single line this needs to be addressed by enhancing the patch manager.

Sample commit message:

ticket:000 Fixed problem with foo

Foo now uses bar as support function to work properly...
...

[Dimitar Misev]

Just make proper sentences, you don't need to write paragraphs in the patch subjects ;D

[Dimitar Misev]

We need to make this regexp include new lines I think:

r = re.compile(r'\[PATCH[^\]]*\]( *\[[^\]]*\])* *(.*)', re.DOTALL)

[abeccati]

And here comes the rationale for it:
​http://git-scm.com/book/en/Distributed-Git-Contributing-to-a-Project#Commit-Guidelines

It looks like you should put entire chapters in a commit message

We can live with one liners but I hope someone can take this on so we can support more detail in commit messages.