Define vector table constants and types inside vector table class. see #12
Rename vector table variable and memory section to reflect location in flash memory. see #12
Define a RAM copy of the vector table and copy contents of flash table to it in vector table initialization method. see #12
Add methods to set and clear ISRs in the vector table. see #12
Register PIT interrupt handler during initialization. see #12
Add comments to vector table entries. Change vector table interrupt IDs to match IRQ numbers in Freescale documentation. see #12
Merge cr-12 to master.