This commit adds an option to disable migration of the milestones from
trac.

This commit adds a new boolean config option:

```
migrate_milestones: no
```

This commit adds an option to decide if a component should be added as
label to the Gitlab issue, this is especially useful with the
component filter issue, if components were used as projects in trac.

This commit adds a new config option:

```
add_component_as_label: no
```

This commit fixes that attachments with no comment would be migrated to
the previously migrated comment, therefore ending up being associated
with the wrong user.

This adds an option to only migrate tickets with one of the given
component names.

This commit adds a new config option:

```
component_filter: [
    u'Server Component',
    u'Server Legacy Component',
    ]
```

This adds the ability to specify a label, which will be added to all
migrated issues in Gitlab.

This commit introduces a new config option:

```
add_label: Websites
```

Severity will be migrates as labels over to gitlab:

- High as critical
- Medium as no additional label
- Low as minor

This adds support for migrating the keywords from trac, which will be
added as labels in Gitlab.

This introduces a new boolean config option:

```
migrate_keywords: yes
```

Issues can now be blacklisted, those issues will not be migrated.
To blacklist an issue, specify the array of issues you want to blacklist
in your config:

```
blacklist_issues: [ 268, 843 ]
```

* add generated gitlab_direct/model817.py

* fix generated model

* switch to 8.17 model

* add model.py to make model updating less conflicting

* make import use MODEL_VERSION env if available

Add verbatim schema output from peewee pwiz.py. Modified assignments for
database_proxy and BaseModel.Meta.database to match prior schemas modules.

Update imports to model816.

* fix formatting for changeset comments

* order tickets by id when querying from trac

* replace preformatted text areas with proper markdown

* convert milestone descriptions to markdown

* python 3 fixes

* add 8.15 model

* add type to created labels

add 8.13 model

Support Trac projects that don't have components.

Make database host address configurable.

Use Python from env. Fixes using inside virtualenv.

Fixed typo

Prevent crashing with a KeyError because src_ticket_data['component'] is
empty.

Useful for installations that don't use the Gitlab builtin PostgreSQL.

Signed-off-by: Israel G. Lugo <israel.lugo@lugosys.com>

Signed-off-by: Israel G. Lugo <israel.lugo@lugosys.com>

add support for importing only certain issues

lazy init sqlite3

add autogenerated model for gitlab 8.7 (8.7.2-ce.0)

Update README.md

use unicode in user map, so accented names get mapped properly

for example: u'Kārlis'