Changes

'''<u>concurrent_hash_map</u>''' : A container class that supports hashing in parallel. The generated keys are not ordered and there will always be at least 1 element for a key. Defined within "'''tbb/concurrent_hash_map.h'''"

<u>'''parallel_for:'''</u> Provides concurrent support for for loops. This allows data to be divided up into chunks that each thread can work on. The code is defined in "'''tbb/parallel_for.h'''" and takes the template of: