Update to add variable length encoding for bit array

Update how word size of bitarray is decided

Add encoding routines

formating

Update README

minor

Update README

rename

Move tests, fix overflow with I/O due to non null terminated magic string

documentation

.bin -> .bit

Update add magic string, checks

I/O tests

chunk write

unsigned int -> uint*_t

Add IO to save to disk

Update src, bounds checking

Bounds checking for BitArray_read/write

Remove length member

size -> width