Following Functions have been added :
1. SetCacheDir : Sets the Cache Directory
2. CHANGE AddToCache the image path is now the Cache Directory +
image Path
The Following New Functions have been added
1. AddToCache Adds to the CACHE_LIST map
2. GetFromCache Retrieves path from CACHE_LIST map
3. Rename WriteToCache -> WriteCache()
4. GenerateName now replaces spaces with underscores.
The Caching Module Caches the images that have been extracted and for
persistence writes the images to a cache file.
In the cache file the data is stored by tab separated values
`%s\t%s\t%s`
the cache is first loaded in the memory ( CACHE_LIST ) during the start of application
and then extracted images are added to the map CACHE_LIST which is
writtern to the cache file before exiting the program.
