Convert tests to tcltest and integrate into Travis (#5)

* convert some tests to tcltest

* exit with non-zero value if any test fails

tests/all.tcl

@@ -0,0 +1,38 @@
+#!/usr/bin/env tclsh
+
+package require tcltest
+
+::tcltest::configure -testdir [file dirname [file normalize [info script]]]
+
+# The following will be upleveled and run whenever a test calls
+# ::tcltest::loadTestedCommands
+::tcltest::configure -load {
+
+	namespace import ::tcltest::*
+}
+
+::tcltest::skipFiles [list]
+
+
+# Hook to determine if any of the tests failed. Then we can exit with
+# proper exit code: 0=all passed, 1=one or more failed
+proc tcltest::cleanupTestsHook {} {
+        variable numTests
+        set ::exitCode [expr {$numTests(Failed) > 0}]
+}
+
+
+
+# Allow command line arguments to be passed to the configure command
+# This supports only running a single test or a single test file
+::tcltest::configure {*}$argv
+
+::tcltest::runAllTests
+
+if {$exitCode == 1} {
+        puts "====== FAIL ====="
+        exit $exitCode
+} else {
+        puts "====== SUCCESS ====="
+}
+