Migration from MSTest to NUnit

Using AppDomain.CurrentDomain.BaseDirectory instead of Assembly.GetExecutingAssembly().Location to the determine the location of .docx files and other resources. This method is invariant under the test runner in use.
Resources are set to "Copy if newer" to include them during build.

Fix HelperFunctions.FormatInput doubles new lines (Issue #44)

fixed lastChar initialization

fixed lastChar assignment

fixed double line insertion for \r\n

Fix to prevent deadlocks in multi-threaded applications. See https://support.microsoft.com/en-us/kb/2996566 (Issue 1) for more details. In summary if the document is larger than 10Mb, then deadlocks
can occur in multi-threaded applications. PacketPartStream class is from https://stackoverflow.com/questions/21482820/openxml-hanging-while-writing-elements

See https://support.microsoft.com/en-us/kb/2996566 (Issue 1) for more
details. But in summary if the document is larger than 10Mb, then deadlocks
can occur in multi-threaded applications.

Content and Replacement

Added DocX.iOS + iOS Test app

Add Content Control collection and methods to replace text.

Added example for manipulating a row as pattern in a table.

Changed some solution settings to make sure it works with AnyCpu.

fix custom property name contains space problem

Implemented the cell margins of Table

Fixed the font size changing in Paragraph

Fixed the problem with setting the column width of the whole table.

Fixed the problem with setting the column width for the whole table.
Without this patch the SetColumnWidth method throws the
NullReferenceException if the column widths haven't been initialized
before. Added the test to check the issue and to see whether it's fixed.

Fixed an issue in Replace when the match length is 0 + some optimizations

https://docx.codeplex.com/workitem/13827 - to preserve Formatting during replace operations
https://docx.codeplex.com/workitem/13831 - proper RegEx support allowing RegEx search pattern and substitutions in ReplaceText

This reverts commit aaac2c6176.

Allow a replace to take a func to do work against a regex match. Useful for mailmerge scenarios. Relates to #10

Changed binary in references to Debug\DocX.dll
Attached DocX.dll from both Debug/Release folders so that the project can be used straight away

#3 : Implemented DocX.Copy() for 'Provide a copy constructor for DocX'

#5 : Cleaned up warnings from invalid XML comments