Refine services description in Info.plist

This splits the service offerings in two: One for files, one for text selections. The use of NSSendFileTypes limits the service to only showing up in Finder for supported filetypes. The text selection service description is changed to match the description TextEdit uses for its "Open selection" service. Note that the file service is only compatible with 10.6+.
Enable auto-continuation of Markdown lists in instances where the bullet is not preceded by whitespace
Fix problem with undoing after hitting enter to eliminate auto-inserted list bullet

The deletion of the bullet + whitespace character wasn't going through the proper channels, and wasn't getting registered with the undo manager. Undoing after doing that would, rather than re-insert the bullet, delete some of the adjacent characters.
Fix exception when using Mountain Lion's press-and-hold to insert a special character

Specifically, when you hit a number key (from the pop-up menu) to select which special character. I suspect this causes a nil character to be inserted, or something like that; regardless, and an exception from trying to call a non-existent isEqualToString on it was the result. Switching around the literals and the parameter is a MUCH safer approach, and fixes this exception.
Merge the two service entries into one.

Turns out you can't have the same keyboard shortcut for two items, even if they'll only ever be active in different contexts. Switching back to a single entry solves that. All the other improvements still work, we just don't have two separate labels.
Updated scanning for @done, to allow for @done(date) or @done - date.
Merge pull request #118 from Westacular/list-continuation

Fixes for list continuation
Merge pull request #120 from ender3/master

Updated @done tag scanning to find tags mid-line
Merge pull request #119 from Westacular/services-fix

Refine services description in Info.plist
version bump, pull requests
updated scroll fix
updated scroll fix
merge oops
Add nv url handler and fix external url handling
version bump
Remove unused DroplrKit
Merge pull request #123 from jtamboli/remove-droplr

Remove unused DroplrKit
added a gitignore
Fixed issue #138: Preview's window title failed to update while 'viewing source' was toggled
Change on the "Low Contrast" sheme