add ldap support and minor fixes

pom.xml

src/main/java/org/codelibs/fess/Constants.java

...delibs/fess/app/web/admin/general/AdminGeneralAction.java

...ava/org/codelibs/fess/app/web/admin/general/EditForm.java

...java/org/codelibs/fess/app/web/base/FessSearchAction.java

...org/codelibs/fess/app/web/base/login/FessLoginAssist.java

...ain/java/org/codelibs/fess/app/web/login/LoginAction.java

...main/java/org/codelibs/fess/filter/AdLoginInfoFilter.java

src/main/java/org/codelibs/fess/helper/AdRoleHelper.java

src/main/java/org/codelibs/fess/ldap/LdapManager.java

src/main/java/org/codelibs/fess/ldap/LdapUser.java

...ain/java/org/codelibs/fess/mylasta/action/FessLabels.java

.../java/org/codelibs/fess/mylasta/direction/FessConfig.java

...ain/java/org/codelibs/fess/mylasta/direction/FessEnv.java

...in/java/org/codelibs/fess/mylasta/direction/FessProp.java

src/main/java/org/codelibs/fess/util/ComponentUtil.java

src/main/resources/app.xml

src/main/resources/fess_config.properties

src/main/resources/fess_label.properties

src/main/resources/fess_label_en.properties