Major update

Custom post type (thumbnail option added)
get_all_HTML (UPDATED)
get_attribute_value_of_tag (UPDATED, not complete)
invalid_tag_name -> is_valid_tag_name (NAME CHANGE)
get_tag_end_position (UPDATED)
get_tag_start_position (UPDATED)
tag_has_attribute_name (UPDATED)
tag_has_attribute_name_and_value(UPDATED, not complete)
view options added