change executable nethod name and readme changes

update readme to reflect the latest example

bug fix: calculating the correct number of goroutines executing (#28)

* correct the number of goroutines count

* change tests

update readme to include executable function

make configurable fields exported

make configurable fields exported

Update readme to add installation and contribution instructions (#25)

* add installation instructions

* add contribution insts

Remove waiters when context is done (#24)

* remove waiters when context is done

* add test for context done with dynamic priority and timeout set

update readme

Cap priority value while dynamically increasing priority of goroutine…

…s. (#12)

* update priority value only if it's not max

* update priority value in test

* use constants in test