Added support to send posts
Changed user timelines

User timelines are now only loaded when needed. Should reduce the API
calls a fair bit.
Fixed issues when loading posts

- Fixed an issue where repostes posts with deleted originals were
throwing exceptions
- Fixed an issue where reposts with deleted original authors were
throwing exceptions
- Deleted authors are now set as User.DeletedUser
- Changed test cases to reflect changes
- Deleted users are chached to reduce API load
- Original posts are now loaded via an async function to reduce API
calls.
Changed Posts

- Added ability to load more posts
- Changed Post-comparison. Newer posts have the lower index now.
- Added appveyor.yml to create artifacts (not sure if it works, though)
Changed appveyor.yml
Merge pull request #1 from ChrisK91/master

update