Merge pull request #17 from achen052/master

Tower Target Reticle, Flying Enemy Balance Change
scene with no red path
Info box in GUI.cs
Merge pull request #18 from Pekklectic/master

Info box in GUI.cs
quick change
Merge branch 'master' of https://github.com/mrome007/cs179ProjectVer1
new weapon system based on streaks
new visual indicators, and streak system update
Towers change for each upgrade

created different towers to show that an upgrade happened.
quick change
quick change
added sub bosses to add variety in gameplay

the sub bosses act more of a target practice, one boss is a simple enemy
that has four parts you have to destroy before killing it, one has a
shield that protects the body and spawns enemies along the path, the
other is a flying unit that heals enemies within its field.
updated spawn system to accomodate sub bosses
quick change
10% chance to spawn sub boss, extra resource

10% chance to spawn sub boss in the middle of a wave, extra resource
added when tower weapon kills an enemy.
fixed wall bug
resource tweaks
Balance Tweaks
balance changes
streak changes, reduced draw calls