https://github.com/jstemmer/go-junit-report/issues/147
By moving the ProcessEvent call up to parse we call it as soon
as each event is read. This ensures that the timestampFunc is
called approximately when the test is run. This ensures that
the time of the whole test suite can be measured.
The gotest parser used a bufio.Scanner to read its input, which
prevented us from reading lines larger than 64K.
In order to support reading larger lines, bufio.Scanner has been
replaced with bufio.Reader. The maximum line size has been increased to
4MiB and instead of returning an error when reading lines that exceed
the maximum size, we truncate that line and continue parsing.
Fixes#135
