v0.3.0

2 new characters have been added:

• Thrall who starts with Circle of Pain.  Thrall can be unlocked by getting the Circle of Pain up to level 6 at least once.
• Aeolus who starts with Tornado.  Aeolus can be unlocked by getting the Tornado up to level 8 at least once

• Enemies are not all red now.  Some are yellow and some are white which makes it easier to tell different types of units apart from each other.
• Bosses have a slight purple outline to make them stand out more as well
• Random minor obstacles have been added to each level.  Rocks and bushes spawn at random locations.