Updated Presentation page to add recent links

Added the links for

    dW Open presentation by Mark
    FOSDEM'17 presentations by Charlie and Matthew
    Separated the links into section with "recent presentations" containing only events that happened in 2017

Signed-off-by: Dorra Bouchiha <dorrab@ca.ibm.com>

resources/presentations.md

@@ -25,6 +25,12 @@ lang: en
 
 # Recent presentations
 
+- [*Highly Surmountable Challenges in Ruby+OMR JIT Compilation*](https://fosdem.org/2017/schedule/event/ruby_highly_surmountable_challenges_in_ruby_omr_jit_compilation/) Matthew Gaudet, FOSDEM, February 2017.
+- [*A different Lua JIT using Eclipse OMR*](https://fosdem.org/2017/schedule/event/eclipse_omr/) Charlie Gracie, FOSDEM, February 2017.
+- [*Eclipse OMR Update Tech Talk*](https://developer.ibm.com/open/videos/eclipse-omr-update-tech-talk/) Mark Stoodley, developerWorks Open, January 2017.
+
+# Previous presentations and events 
+
 - [*Eclipse OMR Tech Talk.*](https://developer.ibm.com/open/videos/eclipse-omr-tech-talk/) Mark Stoodley, developerWorks Open, July 2016.
 - [*OMR: A modern toolkit for building language runtimes*](http://www.slideshare.net/MarkStoodley/omr-a-modern-toolkit-for-building-language-runtimes). Mark Stoodley, EclipseCON, March 2016.
 - [*A JVMs Journey into Polyglot Runtimes.*](https://t.co/efCKf6aCB4) Charlie Gracie, jFokus, February 2016.