Basic editor functionality works.
Minor cleanup.
Clean up tab focusing.
Draft of a bsim highlighter.
Added handling of height changes to editor and demo.
Creating new editor tabs/files now works.
Added a way to close tabs and checking for dirty editors.
Made the Save toolbar button do something.
Fix unwanted side effects of tooltips.
Removed some debug spam.
Close buttons are now circles when the buffer is dirty.
Moved mode_bsim.js to modes/uasm.js
First stab at a tmsim highlighter.
Fix some missing quotes.
Merge branch 'editor' of https://github.com/terman/6.004x into server_and_bootstrap
reading from text file success