Merge pull request #8 from octabrain/master

Implement root directory browsing
changed dir entry length hardcode to strlen(name)
implemented testfs_lookup function
added TESTFS_GET_BLOCK_SIZE function macro
added function super_get_free_data_block_num
added block_bitmap pointer to struct testfs_info
changed indentation on some lines
changes in super_get_free_data_block_num function
changed indentation on some lines
edited comment for super_get_free_data_block_num
added super_get_free_inode_num function
added super_get_free_inode_num function
added super_get_free_inode_num function
added create_fs.sh
fixed bug in get_free_bit_from_bitmap
added inode_bitmap
Add directory removal callback

Signed-off-by: Prashant P Shah <pshah.mumbai@gmail.com>