Revert "Optimize #necessary threads spawned"

This reverts commit ff6d6ea61a2faf281eda371b3a9d61b73ab4afb6.

Conflicts:
	crawler/crawl.py
Revert "Reduce phantomJS driver overhead in thread loop"

This reverts commit 257fbe39910b10edbb2b5112da7a52fc788406eb.

Conflicts:
	crawler/crawl.py
Merge
Merge