Fix file inclusions in gemspec file

We used to include files returned by `Dir['lib/**']`. That only returned
to things:

lib/db_querymatchers.rb
lib/db_querymatchers (the folder)

We fixed that by instead including `Dir[lib/**/*.rb]`, which will return
all the files that we need.

Change-Id: I4c34833b52704a1294345104f353907ef11fa2a1
Reviewed-on: http://gerrit.causes.com/37026
Reviewed-by: Henric Trotzig <henric.trotzig@causes.com>
Tested-by: Henric Trotzig <henric.trotzig@causes.com>
Bump version

Change-Id: I66e491c57cecd672d5ec470086a1d53eac9de29b
Reviewed-on: http://gerrit.causes.com/37027
Reviewed-by: Henric Trotzig <henric.trotzig@causes.com>
Tested-by: Henric Trotzig <henric.trotzig@causes.com>