Enable associating deliveries with a lesson

[Closes #10][Closes #1]

Squashed commit of the following:

commit 34ff4acf4330a3a90d4138f6f92e859520546702
Merge: ed51085 cdab714
Author: Matt Buck <github@matthewbuck.com>
Date:   Sat Nov 16 18:13:28 2013 -0600

    Merge branch 'master' into create-delivery

commit ed510859a24f9baea3e2cb25535d42ed883437ad
Author: Kaoru <dev@kaoruk.com>
Date:   Sat Nov 16 18:10:06 2013 -0600

    Adds delivery helper files generated by rails g conroller

commit b59d24389fb63cb701916d6e08e50faa154bec3e
Author: Kaoru <dev@kaoruk.com>
Date:   Sat Nov 16 17:55:54 2013 -0600

    Links backbone to rails server to create/destroy

commit 66db14ba9302b1ffb6a997e84ef08a2955ba8bc5
Author: Kaoru <dev@kaoruk.com>
Date:   Sat Nov 16 16:52:57 2013 -0600

    Properly sets up Backbone to display new delivery dates

commit 4055044be28ebe9e0b0966c5f9dfff470733c642
Author: Kaoru <dev@kaoruk.com>
Date:   Sat Nov 16 16:35:36 2013 -0600

    Sets up Backbone views, model and collection for deliveries

commit c533278cd7c72fad659a71a1ca7cb9fa67c13cf4
Author: Kaoru <dev@kaoruk.com>
Date:   Sat Nov 16 15:45:58 2013 -0600

    Display delete link next to delivery date, begins to switch over to BB views

commit 602566ea05d09086762fea0c9dfbb3a747f6e127
Author: Kaoru <dev@kaoruk.com>
Date:   Sat Nov 16 15:00:57 2013 -0600

    Displays new delivery dates on DOM

commit cda5158d5ac65af0312c695f3cd79dd5316ff09d
Author: Kaoru <dev@kaoruk.com>
Date:   Sat Nov 16 14:40:59 2013 -0600

    Makes js now handle ajax request of the delivery form

commit 616ab1b3bdc79b23e21e593745571a6bfaf6ec1f
Author: Kaoru <dev@kaoruk.com>
Date:   Sat Nov 16 13:14:03 2013 -0600

    Adds ability to create a delivery date only if it is a valid date

commit c151883eee64e1977a4765e2637aa9d3400a3ad5
Author: Kaoru <dev@kaoruk.com>
Date:   Sat Nov 16 12:51:08 2013 -0600

    Adds delivery form on new page of lesson plan

commit 32fa29cf0d64e596e3c7e88b7f2e34a2ace447fa
Author: Kaoru <dev@kaoruk.com>
Date:   Sat Nov 16 12:43:18 2013 -0600

    Adds delivery model/controller, and Chronic/pry gems