Refactoring and many fixes to PR #378. (Broken)

This commit is broken due to a cleanup issue with NimScript eval.

tests/testCommand/testsFail/testing123.nim

@@ -0,0 +1,4 @@
+
+proc myFunc*() =
+    echo "Executing my func"
+

tests/testCommand/testsFail/testing123.nimble

@@ -0,0 +1,4 @@
+version       = "0.1.0"
+author        = "John Doe"
+description   = "Nimble Test"
+license       = "BSD"

tests/testCommand/testsFail/tests/a.nim

@@ -0,0 +1,6 @@
+import testing123, unittest
+
+test "can compile nimble":
+  echo "First test"
+  myFunc()
+

tests/testCommand/testsFail/tests/b.nim

@@ -0,0 +1,6 @@
+import testing123, unittest
+
+test "can compile nimble":
+  echo "Failing Second test"
+  assert(false)
+

tests/testCommand/testsFail/tests/c.nim

@@ -0,0 +1,7 @@
+import testing123, unittest
+
+test "can compile nimble":
+  echo "Third test"
+  myFunc()
+
+