Installation scripts for daemon mode on Ubuntu using Upstart (resubmission)

Contains configuration files and an installation script for setting up Master Core (`bitcoind`) in daemon mode on Ubuntu using the Upstart init daemon. This is part of the work necessary to implement Issue #131, but does not address the actual packaging.

Some of the files are from the current [upstream](https://github.com/bitcoin/bitcoin) `master` branch. The files in `contrib/msc-ubuntu` were created specifically for Master Core (a README and a default `bitcoin.conf` file for Master Core)

Here are some of the merged upstream PR's included in this "back-port" to Master Core.
* [bitcoin #4611](https://github.com/bitcoin/bitcoin/pull/4611)
* [bitcoin #4577](https://github.com/bitcoin/bitcoin/pull/4577)

Upstream issues:
* [bitcoin #4124](https://github.com/bitcoin/bitcoin/issues/4124)

Note: This is a resubmitted PR, the original PR was #129. This PR is now based off of the `mscore-0.0.8` branch and includes a [change](https://github.com/msgilligan/mastercore/commit/440f19274d63b5dfe2599ac5f88b40bc42209aa7) suggested by @dexX7.