Fix typo
Fix glob issues with fish shell

Closes #83.
Add a CONTRIBUTING file

Leave the README section in place, as we link to it from all over the
place.
Silence errors in :helptags

Closes #90.
Always warn on deprecated API
Use fnameescape not `=...`
Update comment to match readme
pathogen#slash() alias for pathogen#separator()
Ignore non-string arguments to infect

Allow for an options dictionary to be passed in the future.
Use a dictionary to track done bundles
Document session options limitations

References #16.
Better check for help files in doc directory
Typo fix
Alias pathogen#interpose() to incubate()

We can do better than cutesy.
Don't redundantly filter ~ suffixes

This is already handled by glob() due to the 'suffixes' option
Start renaming pathogen_disabled to pathogen_blacklist
Swap out deprecated functions for their replacements
Steer people to pathogen#infect() in deprecations
Fix zero arity invocation of runtime_append_all_bundles
Fix message