Compiler update (#21)

* added seperate folders for cmd packages.

* Fix netmodes in test + reverse bigint bytes

* glide get deps

* add, sub, mul, div

* booleans

* strings

* binary expressions

* if statements

* function calls

* composite literals (slice, array)

* Added lots of test cases and update readme.

pkg/util/uint256.go

@@ -45,8 +45,12 @@ func Uint256DecodeFromBytes(b []byte) (Uint256, error) {
 
 // ToArrayReverse return a reversed version of the given byte slice.
 func ToArrayReverse(b []byte) []byte {
-	dest := make([]byte, len(b))
+	// Protect from big.Ints that have 1 len bytes.
+	if len(b) < 2 {
+		return b
+	}
 
+	dest := make([]byte, len(b))
 	for i, j := 0, len(b)-1; i < j; i, j = i+1, j-1 {
 		dest[i], dest[j] = b[j], b[i]
 	}