Release of v0.26.1

LibJs-Skycoin 0.26.1 - 2019/07/25

Added

• Feature compatible with Skycoin v0.26.0
• Javascript specific SWIG typemaps
• Support for api, cipher, cli, coin, params, util, wallet, wallet_option
• Development setup instructions in README.md
• Release process documented in README.md
• Add make build target to build solution based on SWIG-generated PInvoke wrappers
• Add make help
• Add skyapi, a wrapper for Skycoin api in version 0.26.0