Fix documentation

This aims to close #99 (closed)

Currently having some issues with the Vala stuff. Vala related: #177

Current problems (with vala commit):

[1/15] Compiling Vala source ../src/calls-phone-number-query.vala ../src/calls-best-match-view.vala
FAILED: src/libcalls-doc.so.p/calls-phone-number-query.c src/libcalls-doc.so.p/calls-best-match-view.c src/calls-doc.h src/calls-doc.vapi 
valac -C --debug --debug --pkg wayland-client --pkg gnome-desktop-3.0 --pkg libcallaudio-0 --pkg folks --pkg libebook-contacts-1.2 --pkg gom-1.0 --pkg libpeas-1.0 --pkg libfeedback-0.0 --pkg libhandy-1 --pkg gtk+-3.0 --pkg gobject-2.0 --color=always --directory src/libcalls-doc.so.p --basedir ../src --library calls-doc --header src/calls-doc.h --vapi ../calls-doc.vapi ../src/calls-phone-number-query.vala ../src/calls-best-match-view.vala
error: Package `wayland-client' not found in specified Vala API directories or GObject-Introspection GIR directories
error: Package `libcallaudio-0' not found in specified Vala API directories or GObject-Introspection GIR directories
error: Package `gom-1.0' not found in specified Vala API directories or GObject-Introspection GIR directories

Current problems (without the vala commit):

/usr/bin/ld: src/libcalls-doc.so.p/calls-contacts.c.o: in function `calls_contacts_lookup_phone_number':
/home/devrtz/git/calls/_build/../src/calls-contacts.c:196: undefined reference to `calls_phone_number_query_new'
/usr/bin/ld: /home/devrtz/git/calls/_build/../src/calls-contacts.c:198: undefined reference to `calls_best_match_view_new'
/usr/bin/ld: src/libcalls-doc.so.p/calls-best-match.c.o: in function `calls_best_match_class_init':
/home/devrtz/git/calls/_build/../src/calls-best-match.c:486: undefined reference to `calls_best_match_view_get_type'
/usr/bin/ld: src/libcalls-doc.so.p/calls-best-match.c.o: in function `update_best_match':
/home/devrtz/git/calls/_build/../src/calls-best-match.c:346: undefined reference to `calls_best_match_view_get_best_match'
/usr/bin/ld: src/libcalls-doc.so.p/calls-best-match.c.o: in function `set_property':
/home/devrtz/git/calls/_build/../src/calls-best-match.c:400: undefined reference to `calls_best_match_view_get_type'
/usr/bin/ld: src/libcalls-doc.so.p/calls-best-match.c.o: in function `calls_best_match_new':
/home/devrtz/git/calls/_build/../src/calls-best-match.c:527: undefined reference to `calls_best_match_view_get_type'