Keep reblog box open if the tags or caption inputs have keyboard focus
Add keyboard shortcuts to One-Click Postage

- R/Q/D to reblog/queue/draft a post
- T to open the post box with the tag field focussed
- Escape to unfocus and close the post box if the tag or caption fields are focussed

Ensure that the post box appears on-screen when shown using the keyboard for long posts
Merge pull request #111 from nhinds/one_click_postage_keyboard_shortcuts

One click postage keyboard shortcuts