Added taplog command.
Refactored code for breakpoint hit callback, added needed comments. Added separated exceptions for different architectures at functionPreambleExpressionForObjectParameterAtIndex
Check vc is not nil to prevent infinite recursion

If vc is nil then '[[vc presentedViewController] presentingViewController] == vc' returns true, so this function recurses endlessly.

Steps to reproduce:

1. Create a new project in Xcode, choose iOS > Single View Application
2. In the generated view controller class, set a breakpoint in -viewDidLoad on the call to [super viewDidLoad]
3. Run the app in the simulator
4. When the breakpoint is hit, type `pvc` in the console
Merge pull request #8 from simonwhitaker/fix-infinite-recursion

Check vc is not nil to prevent infinite recursion
Added syntax highlighting to code blocks
Revert "Updated with correct installation instructions. Closes #5"

This reverts commit e4ba069b048f4170fad699670e6424a199be32c0.
Fix the instructions for importing chisel into the .lldbinit file.
Merge pull request #10 from Ashton-W/master

Added syntax highlighting to code blocks in README
Merge pull request #4 from facebook/taplog

Added taplog command.
Added Find Owning View Controller command

Shortcut is `fovc`. Given an input `UIView` this command will walk the next
responder chain until it fines the UIViewController that owns this view.