Added Login and Register Activities
Attempting a tabbed view.

First method of doing this. Not very pretty, but reasonably extensible..
Will try another branch with default tabHost
started work on book adapter and populating the list
Put sample data in.

Wrote Book class
Wrote BookAdapter to handle the inputting of data into the list view
Spacing and Colour

Changed the spacing a little bit and added some colour.
Added GetJSONArrayTask.java
Tab overhaul. Some cleanup needed.
Merged in login/register Activities
Worked on #2 created item views for different tabs

Wrote Layout Resources for Listings/Courses
Wrote Fragments for Courses/Listings.
Wrote Adapters for Listings/Courses
Populated all three with some sample Data.
Modified the PagerAdapter so that the Tabs are in order.

Still need to work out how we want to store images. Using local
resources for now, but I added a "image_url" Parameter to the book class
constructor, as that is what it will eventually be taking.

That's most of it.
Added the ISBN Search screen. Worked on #3

Just the view for it, no logic behind it yet.
Pressing the Plus leads to ISBN search screen.
Added a search button and a + button to action bar. Search currently
does nothing.
Threw icons for all sizes into appropriate drawable folder.
Modified Main Activity to load the new actionbar resource file. We can
probably delete the old one.
Created an activity for the ISBN scanner

The scanner pulls up another app to actually read the barcode for us
then returns it as a string. If the other app is not installed it
redirects it to the play store for the user to download
removed fragment
Merge remote-tracking branch 'origin/ISBN_Scanner' into Add_listing_activity

Conflicts:
	TextbookMarket/src/main/AndroidManifest.xml
	TextbookMarket/src/main/res/layout/fragment_tabs.xml
	TextbookMarket/src/main/res/values/strings.xml
fxiedsome random frasgment shti.

also imd runk
Can now get arrays of books from API
Book images now load in the ListView
Books now maintain references to images that were loaded for them
Merge branch 'tab_view_ansync' into Add_listing_activity