Fix search for C++ and C#

[jace]

C++ and C# are reduced to C by PostgreSQL's full text indexing because punctuation is discarded. It should be possible to apply a synonym dictionary before indexing and querying according to these links:

http://stackoverflow.com/questions/2242368/how-can-i-match-things-like-c-and-c-in-postgresqls-full-text-search
http://www.postgresql.org/docs/9.4/static/textsearch-dictionaries.html

(Neither link is clear on whether synonym dictionaries can be used for words with punctuations like C++ and C#.)

Unfortunately, PostgreSQL dictionaries require a file to be placed in PostgreSQL's shared folders, which is out of scope for deployment with either a database migration or a Makefile. Implementing this dictionary will have to be a one-off manual task on the server, with a note left in the README for future deployments.