Reputation: +donate -crew

Add to reputation when donating money to charity. The current mechanism here presented is my take on this and a first draft.

How much reputation one can "buy" by donating to charities depend on how much you donate, as well as how much reputation you already have.

For a player with zero reputation donating $10^x will get 2^x in reputation. 

![rep](https://f.cloud.github.com/assets/619390/2241086/93367476-9cbf-11e3-99e3-f72373bd5abd.png)
Note log-log scale on axis.

Reading the new manual on the wiki, it said you loose reputation if you don't pay your crew. With this commit it will be so. -0.5 in rep for each payment missed. I tried with -1 first, but that will reduce your reputation a bit too fast when I tested it.