added fibo.cpp
updated make file
update fibonacci class to handle upto 100th number in fibonacci series
added sample code for heaps
added sample code to generate permutation of string
added sample code to solve the 'unique island' problem
added code to find top 4 of given numbers
updated make file for recent sample addition
updated make file to name binaries appropriately. Generated output files shall be ignored by .gitignore
 updated make file; cleaning required name updates