Safe directory changes

Pre-change/post-change commands have been added for following the active
directory. The included defaults will save the current bash line,
execute a 'cd' command, and then restore the current bash line.

This prevents unintentional command execution.

All commands and pre-command/post-command sequences have been added to
GSettings as configurable elements. A currently inactivated option to
control how much the terminal follows the command prompt has also been
added.
Fix terminal window clipping outside of vertical pane on resize.

VTETerminal does not work properly with a ScrolledWindow. Instead,
it needs to be packed in an HBox with an attached VScrollBar.

The terminal window now resizes properly.
Update authorship and branding details more thoroughly.

This commit updates the copyright, README and other headers to
accurately reflect that nemo-terminal is a fairly customized derivative
of nautilus-terminal at this point and to point the website for source
code to the linuxmint/nemo-extensions repository.

It also includes the latest changelog.
Merge pull request #34 from wrouesnel/nemo-terminal

Nemo terminal 1.0.1