add a version.log and release v1.1.0

scripts/cnmfe_version.m

@@ -0,0 +1,18 @@
+%% get the current version of CNMF-E 
+version_file = fullfile(cnmfe_folder, 'versions.log'); 
+
+tmp_f = fopen(version_file, 'r'); 
+
+version_line = fgetl(tmp_f); 
+commit_line = fgetl(tmp_f); 
+
+disp(version_line); 
+
+%% in case you are using git to manage your CNMF-E pacage 
+try 
+    [s,git_hash_string] = system('git rev-parse HEAD'); 
+    commit_line = sprintf('git commit: %s', git_hash_string); 
+    disp(commit_line); 
+catch 
+    disp(commit_line); 
+end 

versions.log

@@ -0,0 +1,12 @@
+version: 1.1.0
+git commit: acdd20b5cecbc8be85f7684aa8e11176d10a3aa2
+
+10/09/2018
+Version 1.1.0 
+git commit: acdd20b5cecbc8be85f7684aa8e11176d10a3aa2
+Note: all updates since the first releast. 
+
+01/15/2018 
+Version 1.0.0
+git commit: 088afc143f84d384c38c50e7c3cda6f040e5f57a
+Note: The first version released in support of our eLife paper. https://cdn.elifesciences.org/articles/28728/elife-28728-v1.pdf