init v3.2.5
make more robust 'get_isbn'
add a cache to metadata (#47)
update .gitignore
fine tune coverage
test with no cache
add a cache to metadata (#47)
compare lowercase
fmt docstring
refact metadata
set cache on conf directory
close 3.2.5 (NOT RELEASED)
init v3.3.1
rearrange imports
frontload conf and settings
add 'delcache' to 'isbn_conf'
add 'internet_on'
add the possibility of a further service called 'cache'
keep it simple, just add a cache (close #47)
update docs on issue #55