Fixed top_buyers

Added institution siglum in the legislator URL

Thanks @wpjunior
Makefile: Added clean target
Changing party siglum size from 10 to 15

Siglum: Solidariedade
Home: Added ALGO
[WIP] Colector para Goiás, Bão dimais =)
Retrieve legislator images =)

Signed-off-by: Wilson Júnior <wilsonpjunior@gmail.com>