power operator + tests
fix the precedence test so it's actually meaningful
Merge branch 'power-operator' of git://github.com/charliesome/coffee-script into more-math-operators

Conflicts:
	src/nodes.coffee
	test/operators.coffee
Make power operator compilation use proper AST nodes
Make power operator have higher precedence than unary operators: +, -, ~, !
Add floor division `//` and modulo `%%` operators, and compound forms of the new operators

Also kill the empty regex :(
Add power operator to the list of tokens that force a line continuation if they appear at the end of a line
Fix #1069. Non-callable literals shouldn't compile
Fix #2953. Method calls on splice endpoints
parallelized script loading in browser, yet order remain
remove logic redundancy
simplify logic and changing less from before
rebuild for PR #3012
Disallow single-line `IF expr ELSE` without `THEN`

* Supplement missing block before `ELSE` token only for multi-line `if`.
* Don't prematurely remove `TERMINATOR` before `ELSE` (so we can  differentiate single- and multi-line forms).
* Cleanup: Remove `WHEN` from `EXPRESSION_CLOSE`. (Only `LEADING_WHEN` tokens are preceded by a `TERMINATOR`.)
* Cleanup: Remove really old, inapplicable text from comment.
Fix multi-line if-else in single-line expression.

* When searching for the closing token of a single-line expression, ignore TERMINATORS that will subsequently be removed.
* Add a test.
Merge `removeMidExpressionNewlines` into `addImplicitIndentation`

and rename it to `normalizeLines`
Make the REPL use the global context to be consistent with the node REPL.

This will make packages that modify prototypes - e.g. 'colors', 'sugar'
- work as expected.

To verify that the `node` REPL uses the global context, execute `global
=== module.exports.repl.context`.

Note: Tests pass, except `cluster.coffee`, which, however, failed even
before these modifications.
Amended - Make the REPL *CLI* use the global context so as to be consistent with the `node` REPL CLI.

(My apologies: In the previous commit I accidentally made `useGlobal:
yes` the default for _programmatic_ use also, but the intent was to
only do it for the stand-alone *CLI*.)

Make the REPL *CLI* use the global context so as to (a) be consistent
with the `node` REPL CLI and, therefore, (b) make packages that modify
native prototypes (such as 'colors' and 'sugar') work as expected.

Note that, by contrast, programmatic use (`require 'repl'`) will
continue to default to a NON-global context - again, consistent with
node's behavior.
Refactored inline-if into more readable multi-line statement.
Fix formatting issues in underscore.coffee documentation (generated html)

Use docco to regenerate documentation for underscore.coffee.