Removes merge markers.

Somehow I missed one of those in one of the merges the other day.
Removes a TODO.

Password file will be created now if not present. Same for the config
file.
Removes get_config() method in Model.

Contoller methods now check if a config file is present or not.
The Model however has self.config, an MyConfigParser object.
I was not happy with the way ConfigParser writes the config files
('=' as a delimiter between keys and values, I wanted ':' instead).
MyConfigParser is derived from ConfigParser.ConfigParser() and
overrides the write method.
Separates hello message from info line.
Activates code that creates .trove directory in HOME if it does not exist.
Saves trove dir in Model member variable.
Print success message after cmd has been executed.

TODO: We should actually check the exit code of all model.execute statements.
Fixes error in no Git message. Works now.

One can test the 'no Git' case simply by making PATH empty.
Then the shell does not find the Git executable.
We do not want to see stderr when calling model.execute

It is handled internally at least in this case. All other
appearances of the execute method should be extended to check
for the return_code of the command in question.
Simplifies startup.

- Config file is now created in $HOME/.trove
- Only General section is written to config file
- No encrypted files are created (yet)
  (will implement a command for this, it's cleaner that way)
- General section only contains color right now (cases still need to be implemented)
  (will add warning for SHA1 inconsistencies later again)
Adds support for no color.

If the user specifies color=False (or anything which is not the
string 'True') in the General section of the config file, all
output will be colorless. If no General section is found in the
config file, the default setting is True for color.
Fixes bug in case config file is empty.
Adds a return None to all do_ methods which did not have one.
Fixes a typo in View.
No empty square brackets in ask_for() when adding an entry.
Fixes an error in do_edit().