unify makefile

[vixentael]

unify makefile: add install, install_all, test_all commands

similar to
cossacklabs/themis#248

[Lagovas]

here make install do not the same as in other our products. here it will copy binaries to REPO_DIR/build (

acra/Makefile

Line 4 in fa860a2

BIN_PATH = build

) when other our products place binaries to /usr/lib/*. I think we should install acra binaries to /usr/bin as default
and after changing path is important to drop this command -

acra/Makefile

Line 48 in fa860a2

@rm -rf $(BIN_PATH)

and explicitly list all binaries that should be deleted (acraproxy, acraserver, acra_genkeys, acra_rollback, acra_genpoisonrecord, acra_addzone) or it will delete /usr/bin folder when user will run sudo make clean :)

[vixentael]

as result we decided that it's okay to install acra to the local folder using make install, because "normal users" will use go get github.com/cossacklabs/acra/cmd/... that will install acra according to their environment