Better Getting Started instructions

Mostly taken from ReactiveCocoa/ReactiveCocoa
Merge pull request #60 from octokit/better-build-instructions

Better Getting Started instructions
Repoint ISO8601DateFormatter to boredzo/iso-8601-date-formatter
++OHHTTPStubs for iOS tests.
Merge pull request #65 from octokit/fix-ios-tests

Bump OHHTTPStubs for iOS test fixes.
Add missing step to the build instructions.

And mention creating a workspace.
Merge pull request #67 from octokit/better-build-instructions

Add missing step to the build instructions.
Add more missing steps to the build instructions.

- Mantle must also be added to the project workspace in the same manner as
  ReactiveCocoa. More so both ReactiveCocoa and Mantle must be added to the
  copy frameworks build phase or else the application will not start.
- The copy phase is a bit tricky as it involves quite a few steps to get it
  right, thusly I added a section describing how to do it.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>
Improve the layout of dervied data location.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>
Remove unnecessary step in copy framework guide.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>
Improve the wording in the getting started guide.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>
Fix minor issues with copying the frameworks guide.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>
Fix notes.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>
Merge pull request #69 from rastersize/even-better-build-instructions

Add more missing step to the build instructions.
Add explicit imports

In order to get CocoaPods working correctly, I needed to add some
explicit imports that were missing.
Merge pull request #71 from gfontenot/master

Add explicit imports
Mention third-party OctoKit podspecs
Merge pull request #72 from octokit/mention-podspecs

Mention third-party OctoKit podspecs
Fix explicit import of Mantle's value transformer.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>
Change EXTKeyPathCoding to use RAC version.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>