Position generated SVG at top left of canvas

Included changes:
Momentarily disable bounds info; fix text position
Also don't fail in keyword substitution if no keys are found.
Move Layer to top left (0,0) while generating SVG
This produces SVG output without the absolute position from the PS
document.  Currently fails for layer groups due to a PS issue
(investigating).
Work around layer bounds bug for groups.
Disable generator tracking during bounds calculation
Must activate the layer to translate coords to 0,0
Add Joel's code for getting the app path.
Fix app path for Mac
Whitespace cleanup (JSHint)