First commit towards #48, nuking the plugin system

Basically just removed everything and replaced it with direct access to
all relevant objects (textarea, mainwindow etc)
Made textarea.goto_line() str/int-agnostic
Merge branch 'master' into pluginrewrite

Conflicts:
	kalpana.py
	pluginmanager.py
Merge branch 'master' into pluginrewrite

Adds the rewritten config loading.
Made sure kalpana ignores empty lines in loadorder

Duh. Really?
Forgot a "not". Srsly. Fixes #51
Updated plugin_docs.rst

It should now (mostly?) match the changes to the pluginsystem made in
the pluginrewrite branch.
Merge branch 'pluginrewrite'