TRAVIS: add travis.yml
BUILD: Fix common.mk
BUILD: allow to pick up CC from env
BUILD: fix build with clang
TRAVIS: try to fix travis build
TRAVIS: try to fix travis build again
TRAVIS: another try to fix travis build
DEC: make sure all polynomials are shifted [-q/2, q/2]
ALL: use const modifiers on parameters where possible
ASCII->POLY: rm obsolete comments
ASCII->POLY: split up to poly_ascii.c
POLY->ASCII: improve modularity
ENC: rm obsolete comment
BUILD: fix automatic toolchain detection
POLY: add null-ptr tolerant fmpz_cmp_si_n() function
RND: first try of random module

Currently only works with specifying the number
of negative and positive ones.
RND: make random int functions public
RND: use function callback for random ints
DOC: fix various doxygen comments
ALL: rename context to params