Added method to save label locations
Enabled assembler to convert labels in j-type instructions
Fixed bugs with saving labels
Fixed assembler to strip colon from label in map
Changed assembler to require current instruction index as parameter when building instructions
Added label parsing to b-type instructions
Changed assembler to use getter for label map (helps in mocking for tests)
Added branch and jump tokens with labels
Added tests of instruction building with labels
Merge pull request #10 from David1Socha/label

Label