v0.1.7

• All C code in the compiler and vlib has been replaced with V.
• # syntax for embedding C code has been removed.
• Exported functions now need to be marked with pub, all public vlib functions have been updated.
• CI has been set up (Travis + Azure). On every commit and PR it is made sure that V
  can compile itself, all tests pass, and all examples compile.
• More tests have been uploaded.
• Cleaner bytes to string conversion: tos2(bytes) => string(bytes).
• The home page has 3 more examples next to 'hello world' that show the features of the language.
• Lots of bugs and issues fixed.