Add description prompts to Title/Description fields.
Add header to New/Edit Lesson Plan Entry pages.
Change submit button text to "Create New Entry".
Move Type and Location to top of form, add prompt text to Location.
Note that location/description are optional.
Use datetimepicker for Entry form.
Change form submit button text to be more general.
Make entry type more subtle.
Change each Milestone to be a div, not a table.
Merge branch 'lessonplan' of github.com:fuzzie360/coursemology.org into lessonplan

Conflicts:
	app/views/lesson_plan/_milestone.html.erb
Allow start and/or end date to be optional.