Do not pass tile grid to getTile and tileUrlFunc

getTile and the tileUrlFunc are functions of the source, so they do need to be passed the tile grid. The tile source knows its tile grid, and can get the projection's tile grid if it doesn't have a tile grid.
Merge pull request #450 from elemoine/projection-null

Do not pass tile grid to getTile and tileUrlFunc
Update to latest version of pake
Merge pull request #455 from twpayne/update-pake

Update to latest version of pake
Hide the zoom buttons on print
Remove unused ol-renderer-webgl-canvas css class
Merge pull request #440 from fredj/css-print

css cleanups
Fix typo in example.
Rename *.exports to match their *.js counterparts.
Merge pull request #461 from marcjansen/istanbul

Fix typo in example.
More renames as suggested by @elemoine.
Merge pull request #462 from marcjansen/same-name

Rename *.exports to match their *.js counterparts.
Enabling Markdown and other JSDoc improvements

This change enables GitHub flavored markdown for APIdoc
comments. The code example in map.js shows how to use markdown
for code snippets. doc/index.md is now included again as start
page for the docs. Everything in the doc/tutorials directory
will also be added to the docs as tutorial. As an example, I
moved the ol3.md file with the architecture to the tutorials
directory.

Currently properties and methods annotated with @inheritDoc
or @override won't be documented at all. This is a known issue,
so I added a custom JSDoc plugin with a hack to avoid this.
Use bootstrap layout and css from examples

I'm sure this can be made much prettier still, but at least we
have a common theme with the examples now.
Making social links work