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/vm/compiler/tests/if_statement_test.go

@@ -0,0 +1,74 @@
+package compiler_test
+
+var ifStatementTestCases = []testCase{
+	{
+		"if statement LT",
+		`
+		package testcase
+		func Main() int {
+			x := 10
+			if x < 100 {
+				return 1
+			}
+			return 0
+		}
+		`,
+		"54c56b5a6c766b00527ac46c766b00c301649f640b0062030051616c756662030000616c7566",
+	},
+	{
+		"if statement GT",
+		`
+		package testcase
+		func Main() int {
+			x := 10
+			if x > 100 {
+				return 1
+			}
+			return 0
+		}
+		`,
+		"54c56b5a6c766b00527ac46c766b00c30164a0640b0062030051616c756662030000616c7566",
+	},
+	{
+		"if statement GTE",
+		`
+		package testcase
+		func Main() int {
+			x := 10
+			if x >= 100 {
+				return 1
+			}
+			return 0
+		}
+		`,
+		"54c56b5a6c766b00527ac46c766b00c30164a2640b0062030051616c756662030000616c7566",
+	},
+	{
+		"complex if statement with LAND",
+		`
+		package testcase
+		func Main() int {
+			x := 10
+			if x >= 10 && x <= 20 {
+				return 1
+			}
+			return 0
+		}
+		`,
+		"54c56b5a6c766b00527ac46c766b00c35aa26416006c766b00c30114a1640b0062030051616c756662030000616c7566",
+	},
+	{
+		"complex if statement with LOR",
+		`
+		package testcase
+		func Main() int {
+			x := 10
+			if x >= 10 || x <= 20 {
+				return 1
+			}
+			return 0
+		}
+		`,
+		"54c56b5a6c766b00527ac46c766b00c35aa2630e006c766b00c30114a1640b0062030051616c756662030000616c7566",
+	},
+}