Issues with "Api::createRemotelink" method

[aik099]

The Api::createRemotelink method (added in 2.0.0) have following problems:

• it's name violates camelCase naming rules, where each word (except 1st one) in method name must be capitalized (should be Api::createRemoteLink)
• the globalid parameter in API call should be named globalId instead (see https://docs.atlassian.com/jira/REST/latest/#api/2/issue-createOrUpdateRemoteIssueLink)
• the globalid and relationship parameters shouldn't be passed to API call when they values are empty

Related to #43

[glensc]

the second point was fixed in #178

cross it out or add link ;)

[aik099]

the second point was fixed in #178

cross it out or add link ;)

Done.