Added all 0.7.0 binaries and fixed a couple issues.

Now others should be able to create builds easily since I'm committing
all of the *.dll and *.exe binaries.  I'm old school and I didn't want
to do it but for Gow to live on it needs to be easy to build and
enhance.

I am committing the old 0.7.0 binaries for now.  The next commit or
two will include all of the binaries.

I also updated the version numbers to 0.7.0 to reflect the version.
Added PuTTy 0.63, Markdown ReadMe, Nano etc.

new file:   .gitignore
* Added the installer file so that it doesn't get picked up.

new file:   ReadMe.md
deleted:    ReadMe.txt
* Renamed ReadMe.txt to ReadMe.md so that it looks nicer.
* Added links at the top of the file, especially the Download link so that
  people can quickly get it.
* Added some quotes about the project.
* Added the Contributing link.

modified:   bin/gow.vbs
modified:   setup/Gow.nsi
* Updated the version to 0.8.0.

renamed:    bin/sort.exe -> bin/gsort.exe
* Renamed to gsort.exe

new file:   bin/libiconv2.dll
* This is just a copy of libiconv-2.dll for ls.exe so that it works.

new file:   bin/nano.exe
* Added GNU Nano 2.3.1.

modified:   bin/pageant.exe, bin/plink.exe, bin/pscp.exe, bin/psftp.exe,
            bin/putty.exe, bin/puttygen.exe
* Updated PuTTy to 0.63.
Updated cURL & Vim and ssh alias for plink.

modified:   bin/curl.exe
* Updated cURL to 7.35.0.

new file:   bin/ssh.bat
* Alias for plink.exe so you can run the 'ssh' command.

modified:   bin/vim.exe
* Updated Vim to 7.3_46.