mDNS Handling

[lbussy]

This release primarily adds support for mDNS and name resolution.

Features

• a302153 Add mDNS and name resolution support
• a2ade71 Make sure ipurl is distinct, convert IP to string
• 235a2e5 Use separate resolution method for mDNS
• d25f1fb Add notice about timers and radio functions in README
• f790016 Remove getIP() from init to avoid radio trouble
• 98711c6 Add Arduino Lib Manager image to README
• 5c29ed5 Use cached IP if it exists in getIPAuthority() (allows pre-fetching with getIP())
• dfb6fc5 Update README with new IP/mDNS features

Bug Fixes

• 6e0e3af Resolve issue where host duplicates in concatenated URL when initialization URL has with no path

[lbussy]

Travis integration is not complete - disabling for now.