style
file move should throw if dest dir doesn't exist.
adapted MockFileSystem.AddDirectory
adapted MockDirectory.CreateDirectory
Merge pull request #78 from manne/directory

Adapted some Directory methods in TestingHelpers
Merge pull request #77 from wtjones/filemove-should-validate-directory

file move should throw if dest dir doesn't exist.
Merge pull request #79 from manne/filesysteminfo_style

improved style in MockFileInfo.LastWriteTime
modified Path.GetFullPath in TestingHelpers, it does respect relative and absolute paths
adapted pattern to find directories

added/modified tests
Merge pull request #80 from manne/full_path

modified Path.GetFullPath in TestingHelpers
Merge pull request #81 from manne/dir_pattern

adapted pattern to find directories
Added implementation for Create,CreateText and Open for MockFileInfo
Merge pull request #84 from DiverOfDark/master

Added implementation for Create,CreateText and Open for MockFileInfo
Fixed NullReferenceException behavior in MockDirectory.GetFiles

GetFiles was erroniously returning a NullReferenceException when passing
in a null path. Changed to match Directory.GetFiles behavior which is to
throw an ArgumentNullException.
Merge pull request #85 from bacathey/Fix_Directory_GetFiles_NullReferenceException_behavior

Fixed NullReferenceException behavior in MockDirectory.GetFiles