Simplify "valid_on" function and remove "valid_before" and "valid_after"
Merge branch 'master' of https://github.com/plusvic/yara
Fix incorrect handling of undefined boolean expressions in a for loop
Implement functions sha1 and sha256 in "hash" module
Improve sanitation in PE module to avoid segfaults
Sanitise DLL names in import table and fix memory leak
Improve DLL name validation by rejecting empty names