Issue 291. MkPublicKey.Json() method implemented. MkPublicKey and MkPublicKeys adding nodes to xml bug fixed.
Issue 291. MkPublicKeyTest one-time variables mistake fixed.
Merge branch 'master' of github.com:aistomin/jcabi-github into 291_1
Merge branch 'master' of github.com:aistomin/jcabi-github into 291_1
Issue 291. MkPublicKeyTest variable names changed according to code convention.
Merge pull request #340 from aistomin/291_1

#340: pull request Issue 291. MkPublicKey.Json() method implemented.