Merge pull request #25 from yeukhon/master

Fixed #24, backout #22. Remove inscope=True.
Added exclusion support. Fixed #26.

There are two issues: proxy exclusion should extend to spider and scanner but it doesn't. This is reported in code.google.com/p/zaproxy/issues/detail?id=748.

Second issue is when recurse is True, we must excluse the ``pathX`` in both spider ans canner if we want to skip ``pathX``. This is documented in code.google.com/p/zaproxy/issues/detail?id=749.
Fixed #29. We can specify which one scan policy to disable.

The syntax would be like this:

'policies': {'id1': '0', 'id2': '1', 'id2': '0', ....}
Updated README to include full documentation and options. Fixed #28.
Merge pull request #32 from yeukhon/issue#28

Updated README to include full documentation and options. Fixed #28.
Merge pull request #30 from yeukhon/exclusion

Added exclusion support. Fixed #26.
Merge pull request #31 from yeukhon/issue#29

Fixed #29. We can specify which one scan policy to disable.