Log Message:
Updated package to latest version, 1.0+beta13. Changes include:

1.0+beta13 (05/09/2017)

    Generate toplevel html index for documentation (#224, Thomas Gazagnaire)
    Fix recompilation of native artifacts. Regression introduced in the last \ 
version (1.0+beta12) when digests replaces timestamps for checking staleness \ 
(#238, David Allsopp)

1.0+beta12 (18/08/2017)

    Fix the quoting of FLG lines in generated .merlin files (#200, Marcello Seri)
    Use the full path of archive files when linking. Before jbuilder would do: \ 
-I <path> file.cmxa, now it does -I <path> <path>/file.cmxa. \ 
Fixes #118 and #177
    Use an absolute path for ppx drivers in .merlin files. Merlin <3.0.0 used \ 
to run ppx commands from the directory where the .merlin was present but this is \ 
no longer the case
    Allow to use jbuilder install in contexts other than opam; if ocamlfind is \ 
present in the PATH and the user didn't pass --prefix or --libdir explicitly, \ 
use the output of ocamlfind printconf destdir as destination directory for \ 
library files (#179, Francois Bobot)
    Allow (:include ...) forms in all *flags fields (#153, David Allsopp)
    Add a utop subsommand. Running jbuilder utop in a directory builds and \ 
executes a custom utop toplevel with all libraries defined in the current \ 
directory (#183, Rudi Grinberg)
    Do not accept per_file anymore in preprocess field. per_file was renamed \ 
per_module and it is planned to reuse per_file for another purpose
    Warn when a file is both present in the source tree and generated by a rule. \ 
Before, jbuilder would silently ignore the rule. One now has to add a field \ 
(fallback) to custom rules to keep the current behavior (#218)
    Get rid of the deprecated-ppx-method findlib package for ppx rewriters \ 
(#222, fixes #163)
    Use digests (MD5) of files contents to detect changes rather than just \ 
looking at the timestamps. We still use timestamps to avoid recomputing digests. \ 
The performance difference is negligible and we avoid more useless \ 
recompilations, especially when switching branches for instance (#209, fixes \ 
#158)

1.0+beta11 (21/07/2017)

    Fix the error message when there are more than one <package>.opam file \ 
for a given pacakge
    Report an error when in a wrapped library, a module that is not the toplevel \ 
module depends on the toplevel module. This doesn't make as such a module would \ 
in theory be inaccessible from the outside
    Add ${SCOPE_ROOT} pointing to the root of the current scope, to fix some \ 
misuses of ${ROOT}
    Fix useless hint when all missing dependencies are optional (#137)
    Fix a bug preventing one from generating META.pkg.template with a custom \ 
rule (#190)
    Fix compilation of reason projects: .rei files where ignored and caused the \ 
build to fail (#184)