Added params to paginationHelper & cleanup of code

params options include:

paginationClass (String): class name for bootstrap(like) pagination
div. Default: pagination

first (String): Text for first pager. Default: &larr; First

last (String): Text for last pager. Default: Last &rarr;

previous (String): Text for previous pager. Default: &larr; Previous

next (String): Text for next pager. Default: Next &rarr;