Add a script to add a TimeEntry

A script called 'spent' is added, this script allow the user to add TimeEntries from the CLI.
--

The script allows the user to specify:
1. **issue_id**: the issue id to add a time entry
2. **date**: the date in format %Y-%m-%d
3. **comment**: a comment for the time spent
5. **time**: number of hours IE:0.4, 3
6. **activity**: id of the activity, default is specify in the config file

Usage:
- python spent.py **-i 4435** -t 0.1 -c 'Hell World' **-a 10** -d 2013-11-13