FEATURE: Added support for per-axis grid options and added new option:
"gridLinePattern"
FEATURE: Added documentation of new gridLinePattern and adapted other
grid options
TEST: Added examples of new grid options and features.
TEST: Added automated tests for new grid features.
BUGFIX: Fixed invalid option reference
REFACTORING: Spelling corrections and better documentation.
REFACTORING: Added exception if no y axis has the independentTicks
option activated.
BUG FIX: Changed check to undefined with === as proposed by jslint.
BUGFIX: Fixed jittering test results by ignoring the alpha value in the color checks.
REFACTORING: Fixed wrong indents, missing spaces and too much spaces :-)
Merge branch 'per-axis-grid' of https://github.com/sauter-hq/dygraphs into per-axis-grid
TEST: testGridLinePattern: Fixed bug not correctly resetting the x-value
in each loop
BUGFIX: Fixed test not running die to OS differences. Now the edge pixels arn't checked anymore which works fine on linux and windows.
Merge commit 'de2545148870a1bdb0957c4c42e80bdb8ce1656d' into per-axis-grid
REFACTORING: cleaned up code and style for new grid per axis feature.
Merge remote-tracking branch 'official/master' into per-axis-grid

Conflicts:
	tests/two-axes.html
Merge pull request #241 from sauter-hq/per-axis-grid

per-axis grid options