Added CHANGELOG.md and .gitignore

Author: adeguet1

.gitignore

@@ -0,0 +1,4 @@
+cisstLog.txt
+**/cisstLog.txt
+*~
+CMakeLists.txt.user

CHANGELOG.md

@@ -0,0 +1,23 @@
+Change log
+==========
+
+1.1.0 (2015-04-28)
+==================
+
+* API changes:
+ * Encoder API now uses signed integers, assumes all values are related to mid range (for setters and getters)
+ * Default protocol is now broadcast write if all boards have fireware 4.0 or higher
+* Deprecated features:
+ * `SetUseBroadcastFlag` has been replaced by `SetProtocol`
+* New features:
+ * Added revision number, new header file `AmpIORevision.h` needs to be included
+ * Added method to get encoder channel A/B
+ * Added `ProtocolType` to select between firewire no broadcast, write only broadcast or read/write broadcast
+ * Added method to get encoder bit overflow
+* Bug fixes:
+ * None
+
+1.0.0 (2014-01-24)
+==================
+
+* No change log file, initial release.