Add fan presence application framework

Add class framework for detecting fans by tach

Change-Id: I45295fd6bcd81c62cef36320dfbc4f0da6092557
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
diff --git a/.gitignore b/.gitignore
index d58b9e4..8023943 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,7 +4,7 @@
 Makefile.in

 aclocal.m4

 ar-lib

-arm-openbmc-linux-gnueabi-libtool

+*-libtool

 autom4te.cache*

 compile

 config.*

@@ -17,3 +17,4 @@
 *.la

 *.lo

 *.o

+phosphor-fan-presence-tach