Compiler (#23)

* implemented add, mul, div, sub assign for identifiers.

* Implemented struct field initialization.

* Implemented imports

* Implemented storage VM API (interop layer) + additional bug fixes when encountered.

* Bumped version 0.12.0

* fixed double point extension on compiled output file.

* Fixed bug where callExpr in returns where added to voidCall

* fixed binExpr compare equal

* Check the env for the gopath first

* removed travis.yml

* custom types + implemented general declarations.

* commented out the storage test to make the build pass

pkg/vm/compiler/tests/assign_test.go

@@ -1,4 +1,4 @@
-package compiler_test
+package compiler
 
 var assignTestCases = []testCase{
 	{
@@ -28,4 +28,88 @@ var assignTestCases = []testCase{
 		`,
 		"53c56b546c766b00527ac4586c766b00527ac46203006c766b00c3616c7566",
 	},
+	{
+		"add assign",
+		`
+		package foo
+		func Main() int {
+			x := 4
+			x += 8
+			return x
+		}
+		`,
+		"53c56b546c766b00527ac46c766b00c358936c766b00527ac46203006c766b00c3616c7566",
+	},
+	{
+		"sub assign",
+		`
+		package foo
+		func Main() int {
+			x := 4
+			x -= 2
+			return x
+		}
+		`,
+		"53c56b546c766b00527ac46c766b00c352946c766b00527ac46203006c766b00c3616c7566",
+	},
+	{
+		"mul assign",
+		`
+		package foo
+		func Main() int {
+			x := 4
+			x *= 2
+			return x
+		}
+		`,
+		"53c56b546c766b00527ac46c766b00c352956c766b00527ac46203006c766b00c3616c7566",
+	},
+	{
+		"div assign",
+		`
+		package foo
+		func Main() int {
+			x := 4
+			x /= 2
+			return x
+		}
+		`,
+		"53c56b546c766b00527ac46c766b00c352966c766b00527ac46203006c766b00c3616c7566",
+	},
+	{
+		"add assign binary expr",
+		`
+		package foo
+		func Main() int {
+			x := 4
+			x += 6 + 2
+			return x
+		}
+		`,
+		"53c56b546c766b00527ac46c766b00c358936c766b00527ac46203006c766b00c3616c7566",
+	},
+	{
+		"add assign binary expr ident",
+		`
+		package foo
+		func Main() int {
+			x := 4
+			y := 5
+			x += 6 + y
+			return x
+		}
+		`,
+		"54c56b546c766b00527ac4556c766b51527ac46c766b00c3566c766b51c393936c766b00527ac46203006c766b00c3616c7566",
+	},
+	{
+		"decl assign",
+		`
+		package foo
+		func Main() int {
+			var x int = 4
+			return x
+		}
+		`,
+		"52c56b546c766b00527ac46203006c766b00c3616c7566",
+	},
 }