Added documentation to the begin and end edit methods in the PLDocument.h file.
Added documentation to the PLDocument class and refactored the name of the PLDocument protocol. This protocol is now called PLDocumentSubclass and has been renamed to be more informative regarding its function.
Documented the PLDocument.h and PLDocument.m files. Also reorganized some of the code for better navigation and consistency between interface and implementation.
Removed the need to implement the init method for subclasses of PLDocument by redefining the meaning of nil as an argument of `setData:`.

A nil data object passed to the setData: method of PLDocument subclasses is assumed to reflect a empty document state. Hence, the PLDocument's init method now calls `[self setData:nil];` to put the document instance into a new document state. The documentation for the PLTextDocument was added.
Continued documenting the PLDocumentManager and refactored a method to be more explicit with its functionality.
Added documentation to the PLDocumentManager class.
Re-indented the PLDocumentManager.m file.

Xcode indentation settings were consistent with the system default and caused a re-indentation of the file with 4 spaces. This was corrected and the file was reverted to its previous indentation state.
Refactored the method to create new temporary documents.
Had to remove smart insertions because they were causing Liasis to break when smart quotes were set in system preferences.
Merging develop into documents to fix an issue regarding smart insertions in the text that caused Liasis to crash
Finished documenting the methods in the feature-documents branch.
Reorganized the PLDocumentManager’s methods and re-ordered the private and public methods.
Added a method that allows for selecting the file extension when using the document manager’s savePanel functionality.
Saving a document to a new location now sets the default directory and file name to that of the original document.
Inserted a line after the pragma mark for saving documents.
Resolved a conflict that originated from re-installing the operating system.