Merge pull request #4172 from ethereum/trailing_dot

[BREAKING] Disallow trailing dot not followed by number

test/libsolidity/syntaxTests/parsing/trailing_dot1.sol

@@ -0,0 +1,7 @@
+contract test {
+	uint256 a = 2.2e10;
+	uint256 b = .5E10;
+	uint256 c = 4.e-2;
+}
+// ----
+// TypeError: (70-73): Member "e" not found or not visible after argument-dependent lookup in int_const 4

test/libsolidity/syntaxTests/parsing/trailing_dot2.sol

@@ -0,0 +1,7 @@
+contract test {
+	uint256 a = 2.2e10;
+	uint256 b = .5E10;
+	uint256 c = 2 + 2.;
+}
+// ----
+// ParserError: (76-77): Expected identifier but got ';'

test/libsolidity/syntaxTests/parsing/trailing_dot3.sol

@@ -0,0 +1,4 @@
+contract test {
+	uint a = 2.
+// ----
+// ParserError: (29-29): Expected identifier but got end of source