Fix slow exchanges on linux by adding polling and other improvements (#14)

* add prints to investigate slowness

* add loop sleep for blocking Stack

* add connection close http attribute and detect end of HTML page

* add timeout to bridge read

* examples/xnet: add ntp timestamp to prints and show output in readme

* add polling to http tap interface

* more digits in ntp format

* prevent crashes on non-8 timestamp

.gitignore

@@ -15,6 +15,10 @@ vendor/
 *.so
 *.dylib
 *.hex
+
+# Profiling
+*.pprof
+
 # example binaries.
 /tap
 /stack
@@ -46,6 +50,7 @@ local
 *.zip
 *.gz
 *.tar
+*.txt
 
 # If running a python script.
 */__pycache__/*