Remove old 7z items, add new exe:

* Remove 7zUnicode.exe, will no longer be needed
* Replace 7z.exe with 7za.exe.  7z.exe needs  7z.dll, and their
  combined size is smaller than 7za.exe (since 7zUnicode.exe is no
  longer needed)
* Remove 7zCon.sfx, this was part of the auto-updating system for,
  and isn't needed anymore
* Remove 7z.dll since 7z.exe and 7zUnicode.exe no longer need it
Replace all instances of 7zUnicode.exe/7z.exe with 7za.exe
Remove all references to MSVC 2005 from installers
Remove prepackaged MSVC 2005 runtime files
Change all usages of 7z to use the correct args

-sccUTF-8 ensures UTF-8 encoding on stdin/stdout
correct an error when applying normal BCFs

found during testing of 7z changes
Remove mention of requirement for MSVC 2008

- No longer required for more recent versions of Python 2.7
- Verified to be not required on Python 2.7.8, so packaging script
  requires this at a minimum.

Closes #107
Update Readme.md

Remove mention of MSVC redists.
Readme updates

* Remove mentions of MSVC redist, they are no longer required
* Update links to most recent python dependencies
Remove MSVC manifest file from .gitattributes
Merge branch 'lojack-improve-7z' into dev

Closes #107