Fix some indent problems

[gruehle]

@njx

• Pressing the TAB key on an empty line no longer inserts an additional tab.
• Fixed problem that occasionally added an additional space character when typing a tab.
• Disable built-in "electric chars" feature and replace with a less heavy-handed version. The new version does the following:
  • Only runs when closing braces are typed: "]", "}", or ")"
  • Only runs if the line is all whitespace (except the closing brace)
    This should eliminate the majority of the odd and unpredictable auto-indent behaviors.

This fixes issues #155 and #193.

[njx]

CodeMirror does this:

varch=String.fromCharCode(e.charCode==null ? e.keyCode : e.charCode);

I'm assuming this is to deal with browsers that handle keyCode/charCode differently. Should we do the same?

[gruehle]

Wow, I had no idea how much of a mess JavaScript keyboard handling was until I read this page:
http://unixpapa.com/js/key.html

Luckily, for us, using keypress and checking for ASCII characters is easy:
http://stackoverflow.com/questions/1444477/keycode-and-charcode

Code updated.

[njx]

Done with first review.

[njx]

Just tested this and it isn't working for me. If I'm in a blank JS file and I type:

functionfoo(){blah();

then hit Return after blah(); and type the close-brace, it indents it to the right instead of pulling it back over to the left.

[njx]

It looks like the problem is the "smart" argument--if I remove it, it does the right thing. So it must not be the case that passing "smart" is the same as passing nothing.

[gruehle]

Passing 'smart' wasn't so smart after all... removed.