The name passed to find_package should match the one that is passed to
find_package_handle_standard_args, otherwise the version matching is not
properly done. The names are based on the FindXXX.cmake filename.
This also simplifies components reporting for Libevent (done by
find_package_handle_standard_args) and results in reporting a library
instead of include directory when found.
Add auto-detection to the most important features (app, hpack, etc.).
Move options to a separate file for easier search.
Add cmake-based Libevent, jansson and CUnit search. Move pkg-config
handling for Libev and jemalloc to their cmake files.
Note: duplicates find_package before including CMakeOptions.txt and when
checking for features. Maybe that can be cleaned up later...
Peter Wu