Check vim-erlang-tags options on each call

If pathogen is used to handle plugins in conjuntion to a autocmd for
configuring the plugins on load (to be able to detect if a plugin exists or not
as pathogen loads them after vimrc has been read) the script_opts would not
have been set and calling ErlangTags would ignore it.
Remove script scope from script_opts variable
Merge pull request #5 from sedrik/check-options-everytime

Check vim-erlang-tags options on each call
(#14) Jump to record/marco after '#' or '?'

vim-erlang-tags.erl generates extra tags (#rec for records), and when C-] is
hit on a record, the # is counted as part of the name, so only records tags
will be considered. If there are several records with the same name, it is
still not guaranteed that C-] will jump to the correct one.

Same was implemented for macros and '?'.
Merge pull request #15 from hcs42/records

(#14) Jump to record/marco after '#' or '?'
Add -p/--otp option to include currently active OTP lib_dir