Added slashes2dash function.

This function will be used to process workspace and repository
names. There names can't have one or more slashes because this character
is used to separate workspace/repository for some subcommand.
Raise ValueError when there is too many slashes

find_path function raises ValueError when there is too many slashes in
name argument that expect workspace/repository syntax. The message is
more explicite than string.split() error message.
Use slashes2dash function in workspace subcommands
Use slashes2dash function for show subcommand.
Use slashes2dash for workspaces subcommands.
Removed duplicate test.
Changed confirmation message..
Bump version 0.1.4