Public key authentication key files path as configurable option

Key files path for SFTP public key authentication was made configurable

git config git-ftp.sftp-key ~/.ssh/id_rsa
git config git-ftp.sftp-public-key ~/.ssh/id_rsa

implements resmo/git-ftp/#184
Renamed the parameter names to match curl options

Renamed --sftp-key to --key
Renamed --sftp-public-key to --pubkey
Merge branch 'release/0.8.4' into develop
Repo path wasn't updated
Merge pull request #1 from mamzellejuu/patch-1

Install document outdated. URL is pointing to the wrong repo.
Fixed typo in man page
Merge branch 'develop' of github.com:git-ftp/git-ftp into develop
Replaced equality operator '==' with '='
Updated man page to include the new options.
Merge pull request #6 from JoyceBabu/develop

Public key authentication key files path as configurable option
Fixed a minor formatting issue in INSTALL

The description of installing via Homebrew on OS X 10.8 isn't rendered as code in a Markdown renderer because it's missing a newline.
Merge pull request #14 from louisrli/patch-1

Fixed a minor formatting issue in INSTALL
Add action 'log'
Merge pull request #19 from adbre/action_log

Add action 'log'
Update README.md
Error: binary operator expected.

Patch on Windows 7 X64 (Build 7600) and Ubuntu 10.04.4 environment throwing error binary operator expected.
fix quoting of REMOTE_PASSWD
fix detection of curl verbosity setting
log deletion failure even when being verbose
Merge pull request #36 from JasonWoof/verbosity

fix curl verbosity and error message display