added source file link prefix and relative path logic to retain build number
adding build number
Revert "adding build number- reverting this since relative link would work on jenkins"

This reverts commit 4a9cf4269153794bd304b6845c5890f05cb0fd2a.
moved src_file_link_prefix into a block- removed build_no from get_jenkins_path argumens
removed src_file_link_prefix from the if statements
updated the default value of src_file_link_prefix to None
fixed typo --reatin-build-no to --retain-build-no in options
Merge pull request #1 from mubbashir/link_creation_for_build_and_repo_dir

Added prefix for source dir and a switch to modify relative link to source files to retain build number