RELEASE: version 0.2.5b

- FEATURE (settings): add export/import of user settings
- FEATURE (settings): add export/import of user settings
- FEATURE (single gist): show fork info if gist is forked
- FEATURE (share gist): add auto-completion to share gist
- FEATURE (editor): add preview of markdown
- UI (big files): add indication of big file
- UI (css): add markdown css
- UI (css): update text fields to reflect valid/invalid state
- FIX (editor): fix font size settings issue
- FIX (dotfiles in gist): fix links of dotfiles
- FIX (gist API): gisto fail to handle files >1MB
- FIX (deleting a file): local copies of files now properly delete when not yet saved to GitHub
- FIX (drag & drop): drag area disappears on drag cancel
- FIX: Files that do not exist in github do not send a patch request upon deletion.
- FIX: Fix not being able to save when there is an empty file in create screen.
- FIX (single gist): notify upon Error when creating gist + validate filename with regex.
- FIX (single gist): URLs of gist API for single gist view.
- FIX (single gist): #81 where username was incorrectly pulled from json causing gist file url appear with no username parameter thus double slash.