Fix Linux keybindings

Many thanks to @dsandstrom for this fix.

Added slurp and non OS X keybindings

Breaking Changes

• The key binding cmd-e is now "slurp". The "focus editor" command has now been assigned to cmd-enter.
• Search no longer starts with selected text. Use slurp which starts with selected text.

Slurp

Added the "slurp" (cmd-e OS X / ctrl-e Windows & Linux) command which copies text from the text editor into the find editor, one word at a time. See the description in the README.

Added Windows & Linux keybindings

They are the same as OS X except ctrl is used instead of cmd. Also added a section on making an emacs compatible key map.

Add cmd-e and a bug fix if Enter pressed too fast

Completed #4 which causes cmd-e to set focus to the active code editor, letting you make fixes without canceling the search. Press cmd-i or shift-cmd-i again to resume searching.

Fixed #5 - entering a search and pressing Enter before the search completed would not move the cursor to the first result (since no results had yet been found).

Searches for selected text

If you trigger a search and have text selected, it populates the find editor with the selection. Useful for quickly jumping to the next instance of a selection.

Renamed from isearch to incremental-search

v2.0.0

Prepare 2.0.0 release