Only resize canvas if the size changed.

Resizing the canvas erases it, and Dygraphs had skipped the redraw
when it thought it wasn't necessary, leading to blank graphs after
a redundant .resize() call.
Merge pull request #260 from klausw-g/resize-fix-2

Only resize canvas if the size changed.
Add comment to resize test case as a follow on to pull request 260.
Add comment to resize test case as a follow on to pull request 260.
Merge branch 'master' of https://github.com/danvk/dygraphs
BUGFIX: Fixed Bug created by extracting different rows for each series (to fix the big not connecting lines at edges). Now all calls to the getLeftBoundry method are done with the correct set index resulting in a correct behaviour now.
BUGFIX: Added "this." to the  boundryIds_ calls
TEST: Added test to verify that the left boundry works now.
BUGFIX: Fixed bug using the idxToRow_ function instead of directly taking the row from the point. Also the idxToRow_ method has been completely removed based on Dans comment, that it is unneeded.
Fixed wrong space usage in if clauses.
Merge pull request #262 from sauter-hq/left-boundry-fix

Left boundary fix
Make seriesToPoints_ and stackPoints_ private. They are being rendered as part of JSDoc, which is wrong, but also, seriesToPoints_ has the closure substring "<?", which jsdoc likes to think is PHP.
lightweight dead code elimination
Merge branch 'master' of github.com:danvk/dygraphs
test to track exported symbols in dygraph-combined.js
New dygraphs home page
Add Dygraph.ready() method to simplify annotations usage.
use IE-compatible version of jQuery
fix a few IE issues
make XHR work in IE6