Added martyr_search_tool/sites/aintnumber.py to search aintnumbers.com
site for martyr names.
Modified martyr_search_tool/sites/base_site.py:PaginatedSite to
request multiple pages at the same time, and stop at the first
page group that return a 404 error.
Modified martyr_search_tool/sites/base_site.py:BaseSite to add a user
agent attribute that is updated randonly for each instance. The
user_agent attribute is used for each aiohttp.ClientSession.
Modified return type of BaseSite.search_names to return a list of
SearchResults.
Added new static method CurlGrepSite.grep_html that searches a given
page's html source for a text.
Modified CurlGrepSite.searh_name to return a list of
SearchResult instances.
Added verbose option to martyr_search_tool/main.py.
Modified martyr_search_tool/main.py:main to perform search on multiple
sites at the same time.