Merge pull request #55 from mad-int/master

Advanced Programming - Excerice 6
new method free mem
a bit code cleaning
update Makefile
Update README.md
Merge pull request #56 from rallenz/master

a bit code cleaning
set -O3 to default
bug fix
fix detection of dominated constraints
Merge remote-tracking branch 'upstream/master'
Initial commit for ex6.
Initial commit for ex7.
Split linear_program.c. Put new_lp_from_file into read_lp.c. Start to refine lp API.
Define several getters/setters for lp.
Refine lp API.
Better name for variable assignment.
removed dead code printf
Merge branch 'matthiasMaster'
changed Makefile
faster branching