Suggestions for resolving memory leaks

These changes are suggestions for resolving memory leaks
And the some buffers, which are allocated by "pocl_aligned_malloc", are
deallocated by "free". It makes some troubles. I also suggest all malloc
and calloc should be changed to "pocl_aligned_malloc" also "free" should
be cchanged to "pocl_aligned_free"
Remove comments and etc..

1. Add may name in "CREDITS"
2. Add contents of changes in "CHANGES"
3. Remove comments
4. Apply indentation in clFinish.c
Merge branch 'master' of github.com:leekiju/pocl
Pruned the changes a bit to make it more like an overview.