Apply grammar rules to token replacement values

[1ec5]

Upgraded to osrm-text-instructions v0.9.0. The only substantive change is that Russian grammar rules are now applied to a token replacement value before modification by the client and insertion into the overall instruction string.

The sole unit test for this feature doesn’t run by default: it only runs when the environment is in Russian, since that’s the only language for which grammar rules have been supplied so far.

Fixes #48.

/cc @bsudekum @frederoni @yuryleb