Add CSS classes for more fine-grained styling

1. fce-cols-day-header
2. fce-cols-col-header

Add support for displaying a single column

The new setting (described in the README) is fixedColumn.

v1.11

Bug fixes and better integration with fc-rightclick

v1.10

Update version in JS file.

Add support for external events

Functionality kindly provided by @mitomm. Thanks!

v1.8

Use Universal Module Definition style of defining functionality for better interoperability with other environments such as Node. Thanks @cojack!

v1.7

Calling revertFunc() from eventDrop(...) callback didn't work (issue #14). Fix this. Thanks @mitomm!

v1.6

Add support for column headers (issue #1).

v1.5

Bug fix for more than 7 columns, suggested by @gretaq.

v1.4

Fix previously broken support for FullCalendar's eventMouseover and e…