Print out the task method signature when `fab -d <task_name>`.
Calculate args_without_defaults from args_with_defaults.
Add tests for task details.
Monkey-patch inspect.getargspec for Python 2.5

because the return type changed from plain tuple to namedtuple since 2.6
added test for links

This allows fabric to test if a file exists via symlink since a standard exists will now return the proper result.
Merge branch 'master' into 922-int
Failing test re: wrong indents in multiline docstrings
Bring the indentation of the added detail to the same level of docstring

so that the docstring and the method signature are uniformly indented.
Tweak test for accuracy
Docstring re #922
Fix build status link to match the damn file extension, sheesh
Merge branch 'master' into 925-int
Docstring updates re #925
Syntax/cleanup fixes re #925
Refactor re #925
Integration tests re: #925
Changelog re: #925