Adding grid ftp processing script
Added ability to add free form key/val pairs to payload in metadata post.
Added an option to not write the last record pickle manifest to disc (for development, scanning multiple files, etc).
Abstract out log processing bit pending code that scans for the right log. (and also add *.pickle to .gitignore).
Add logging and initial logic to search the indicated file for the previously loaded record.
Docstrings for new post method.
Filter the default log format and add arg to load a single record (used for development).
Modified post.py so that setting script_alias to '/' will do the same thing as setting it to None.  This is easier for calling programs to set this values via a string command line arg.  Modified load_grid_ftp to include an arg for this value.
Added args to send optional data values and also documentation.