Add switch_to_the_window

• Add switch_to_the_window

Enhance/parallel linkstatus

• Separate parallel for e2e and linkstatus.
• Change parallel helper into module.
• Delete parallel_num in config/bucky_config.yml
• Add e2e_parallel_num in config/e2e_config.yml
• Adjust linkstatus_parallel_num and add linkstatus_thread_num in config/linkstatus_config.yml

v0.9.7: Enhance/parallel to fork (#27)

• add parallel helper

Bug fix for option name

• fix chrome option name

Bug fix for config

• Deal with config not in template

Fix chrome option

• delete js error check
• add headless mode

Fix chrome option

• delete js error check
• add headless mode