Bumps version to 0.14a1.
changelog: Updates latest to 0.13.
database.py: Switches to SQLAlchemy.
hook: Accepts inline, link_type for get_urls() (chfoo/wpull#25).

Moves Callbacks.to_native_type to HookEnvironment.to_script_native_type.
hook.py: Updates docstring for get_urls().
http.py: Adds url_info attribute to Response.
Adds http.RedirectTracker.
processor,robotstxt: Switches to using RedirectTracker.
Implements POSTing from scripts (Closes chfoo/wpull#25).
Implements --post-data, --post-file (Closes chfoo/wpull#8).
changelog: Updates latest to 0.14.
Bumps version to 0.14.

Merge branch 'develop'

Conflicts:
	doc/changelog.rst
	wpull/version.py