Added command line arguments to some tools to let us specify the location at which they are installed.

[curtislacy]

I needed this for curtislacy/omniwallet@9f4b769 - My installer puts the mastercoin-tools in a dependency modules directory, and not at the top of my home directory.

[grazcoin]

see comment on #2 (comment)

[curtislacy]

I understand what you're saying on #2, but this ends up being important when we package things up for easy install in https://github.com/LDEngine/msc-webwallet . See especially the install instructions in the next upcoming version of the README: https://github.com/curtislacy/msc-webwallet/blob/Fix-Transaction-Parsing/README.md

The msc-webwallet product is currently a wrapper around the mastercoin-tools (new UI and some key management stuff is in the works), and we can only reuse the parse and validation tools in our own scripts if we can install them to a location other than the hard-coded default in the home directory).