Clarified some comments.
Removed dead code.
FIxed the parsing and differentiating of the op from the other posts.
Replaced rvalue references with const references.
Added a parse post function to abstract ocmmon code.
Added default contrsutor.
FIxed typos
Added thread and board parameters to the parse post method.
Removed dead code.
Refactored common code.
Removed dead code.
Refactored the thread parser for clarity.
Added parse a thread function because the old one was too tightly coupled with a different type of webpage.
Refactoed to utilise new method.
Added missing return value.
Elided hardcoded board in favour of argument.
Fixed xpath query to only slect the correct divs.
Fixed duplicate thread_ids bug.
Added parse_threads method.
FLeshed out the new multi thread parsing method.